How many houseplant colors do u know?? Help me pls!

Though I am new to growing healthy plants. I would like to start a project on decorating my bay window with colorful houseplants like the ones I already have; Purple Passion and Harmony's Red Robin. I eventually want to end up with six pots, six plants, one of each color of the rainbow. I already have pruple (Purple Passion Velvet plant) and red (Harmony's Red Robin), can you help me find plants in each of the other 4 colors??

Here's the catch: I'm looking for plants that are more leafy than blooming; I don't really want flowers. Also, I'm inexperienced in all this, so easy care is plus!!

Below is a picture of the two plants I have so far for this rainbow. Wish I got a full view of the window, the one I took doesn't show how much space i have to use.

How many combinations can you come up with :D

ROYGBIV - interesting! You've got the ends already. Red leaves are fairly common, so I won't get into that.

Orange:
Codiaeum, croton (also could be included with yellow)
Philodendron cultivars like "prince of orange"
various Begonias
Bromeliad
Euphorbia tirucalli 'Firesticks'
Coleus
Kalanchoe orgyalis

Yellow & green:
including variegations, too many to name

Blue & indigo - the tricky ones!
Graptopetalum paraguayense
Senecio 'Blue Chalk'
Echeverias
Agave
Eucalyptus

Violet: YMMV with the exact shade of these, I had this list already compiled just because I love purple leaves:
Begonia, various, mainly Rex'es
Callisia fragrans
Callisia repens
Capsicum annum, ornamental pepper
Croton
Echeveria
Gibasis geniculata, Tahitian bridal veil
Graptopetalum
Gynura, purple velvet
Hemigraphis, waffle plant
Heuchera, coral bells
Iresine, various
Kalanchoe pumila
Kleinia petrea, formerly Senecio
Lorapetalum
Oxalis triangularis, purple shamrock
Perilla, often mistaken for Coleus
Plectranthus, various
Pseuderanthemum
Schlumbergera truncata, Thanksgiving cactus
Sedum, stonecrop
Senecio, various
Strobilanthes dyerianus, Persian shield
Tradescantia pallida, formerly called Setcreasea pallida
Tradescantia sillamontana
Tradescantia spathacea, formerly called Rhoeo spathacea
Tradescantia zebrina, wandering Jew

Pink isn't part of the rainbow, but I do already have this list, so pasting here also:

Aglaonema, Chinese evergreen
Aloe
Alternanthera, calico plant
Anigozanthos
Aptenia cordifolia, variegated
Begonia
Breynia
Bromeliad
Caladium
Calathea
Cissus discolor, Rex Begonia vine
Coleus
Columnea
Cordyline fruticosa, Ti plant
Crassula
Cryptanthus
Dracaena marginata 'Tricolor'
Echeveria
Euphorbia tithymaloides, formerly Pedilanthes
Ficus
Fittonia, nerve or mosaic plant
Fuchsia
Graptopetalum
Hemigraphis, waffle plant
Hoya
Hypoestes, polka-dot plant
Impatiens
Ipomoea batatas, sweet potato vine
Kalanchoe fedtschenkoi
Iresine
Ludisia disscolor, jewel orchid
Maranta, prayer plant
Pachyveria
Peperomia clusiifolia
Perilla 'Magilla' often mistaken for Coleus
Philodendron, Pink Princess'
Pilea
Plectranthus
Pseuderanthemum
Saintpaulia, African violet
Schlumbergera truncata, Thanksgiving cactus
Sedeveria
Sedum, stonecrop
Stromanthe
Syngonium, arrowhead vine
Trachelospermum asiaticum, Asiatic Jasmine
Tradescantia fluminensis, variegated

omg wow! Your second post is all pink plants? I'm gonna google some of these later, but are there any plants that are really all yellow?

All yellow implies little or no chlorophyll. Look for pale green or chartreuse plants such as ornamental yams, Heuchera hybrid 'Caramel', or similar plants. Not sure if Heuchera will grow indoors, it is an outdoor plant here.

Many plants have splashes and spots of yellow.
Crotans come in many leaf shapes and colors, and many are splashed with several colors. Some are just green and yellow, though. Maybe that would work for you.

Sanseveria (mother in laws tongue) is also available in many patterns. One of the most popular is edged in rich yellow.

, in my earlier reply to your extensive list! I'm still going through some of it. I've got my eye on an orange coleus! And a blue eucalyptus, maybe, if its good for indoors and beginner gardening!

I dunno about Eucalyptus as a house plant.
They are giant trees.
As cuttings they are an added ornament to cut flowers, but to grow one as a house plant? I would not think so!

ok great, because I am new at this I was thinking... "isnt that a big tree like plant?" Maybe I don't want a big tree like plant in my windowsill.... (thats why im here asking you guys!)

there is a blue begonia that is supposed to be iridescent, like my Rex begonia, but apparently its rare and it grows in malaysia... Also googled around and found a page on a blue "Diplazium cordifolium"... any thoughts on these for beginners?

Many house plants can be trees, some huge, that can grow in full sun, various Ficus, various Dracaenas, Schefflera, China doll, ponytail palm, to name a few, not to mention Bonsais of hundreds of different genera, many of which would be huge trees if not manipulated into being bonsais. The deciding factor for a fair attempt is amount of light. How little light will Eucalyptus tolerate? IDK. Who has enough for Eucalyptus? I have no way of knowing that.

As with any tree-in-a-pot, one would guide and shape its' growth to keep its' shape and size appropriate to its' home.

The rainbow thing, with 2 of the colors being blue and indigo, is extremely difficult. If the 6 colors are green, red, yellow, orange, pink, and purple - the possibilities are much more numerous.

Neon Pothos is one of the most yellow plants I've seen.

The lists of pink and purple leaves include stripes, and back/edges of leaves. Not very strict lists, some are much more obviously pink or purple than others. Some of the coloring depends on light exposure. I love them all!

Pixie, knowing more about the window in question would help folks help you steer toward the most appropriate ones when you've picked some you like. Which way does it face? Any trees blocking the light? Curtain situation? You can add a pic if you want, always helpful.

Never heard of Diplazium cordifolium. Doing an image search of that name didn't impress me with "oh those are blue-ish" plants, but what you saw may have been a cultivar developed for/with that trait.

https://www.google.com/search?q=Diplazium+cordifolium&source=lnms&tbm=isch&sa=X&ei=7-mVU6j8FcOg8QHqiYHABQ&ved=0CAYQ_AUoAQ&biw=1088&bih=484

Yes, I plan on taking a picture as soon as i get my camera back! I can't imagine trimming and shaping trees is easy for a beginner planter like myself....

It's not that hard. Practicing on Coleus is fun, inexpensive, easy to find, grows quickly in the same type of branching manner as most woody entities. Pruning a growth tip usually results in bifurcation (2 tips where there was one.) Removing a leaf usually inspires a new branch to grow. The more you pick at a plant, the smaller its' leaves will be.