Sweet Corn with Ornamental Foliage? Black Corn on the Cob?

Is anyone familiar with a variety of sweet/edible corn with variegated and/or colorful foliage?

I've come across Gracillis (green and white striped blades, flint corn), Striped Japonica (white, green and pink striped blades, flint corn) and Old Gold (yellow and green striped blades, flint[?]).

http://www.liseed.org/rambl_corn_ornam.html

They're all attractive, but I'm interested in adding little groups of corn with ornamental foliage to my edible garden. I like to intersperse decorative but edible vegetable plants in my flower beds. I don't have room for a dedicated vegetable garden.

I'm also curious about the edible black sweet corn that I've seen pictures of from China:

http://www.foodiechat.com/black-corn/
http://www.flickr.com/photos/bfishadow/4487205652/

... and apparently also in Peru:

http://www.travelpod.com/travel-photo/marie_mc/1/1212125640/black-corn-on-the-cobxxx.jpg/tpod.html
http://www.notdelia.co.uk/black-corn-on-the-cob/

[photo from liseed.org]]

Don't know anything about pretty corn "plants," but I do grow a little corn, and from my experience, little groups may not pollinate well unless you hand pollinate, and if they are within a 100 feet (?) of each other, or so, they will almost surely cross pollinate unless you take preventive measures. If they cross pollinate, you will have kernels of unknown characteristics for eating, drying, grinding or popping. Corn pollen is disbursed by the wind and so having the stalks close together in one bed will help ensure pollination. Wind pollination, however, also means that your corn could trap pollen from any corn plant near by - yours, your neighbor's or the farmer down the street. Simplified example - if you have red kerneled corn and white kerneled corn, and you find red in your white or visa versa, then you will know that that particular seed was pollinated by the other type. That being said, have fun - I never thought of pretty corn "plants" before. (By the way, even field (animal food) corn is yummy when roasted fresh on the cob and slathered in melted butter!)

Some of the old Robson varieties had a good deal of red/purple on the husks and foliage. There are two black sweet corns but they are white at the eating stage. Mature kernals are black ( Black mexican, Black Aztec)