Ground cover flower seeds to add to lawn

I'm looking for seeds that I can chuck at the bald spots in my lawn and then ignore, which will make flowering ground covers that can stand up to foot traffic and are short enough that flowers will remain after weekly mowing.

I live in the Pacific Northwest, which is zone 8 and pretty much perpetually "part shade". It's soggy in the winter and dry in the summer. Moss is everywhere, although it doesn't seem to choke out the grass.

I'm currently considering the following. Are any of these perfect/terrible for my needs?
Various super short Veronicas (liwanensis, oltensis, pectinata, repens)
Thyme (praecox and serpyllum)
Irish moss / Sagina subulata
Roman chamomile / Chamaemelum nobile
Snow in summer / Cerastium tomentosum
Miniature daisy / Bellium minutum
Moss sandwort / Arenaria verna
Corsican sandwort / Arenaria balearica

I am sorry you did not get a response. I saw this earlier, but really do not have a knowledgeable response with the plant you have asked about.

In my experience, I have never been able to just toss seeds in bare spots. I tried Buffalo grass and native seeds which just sat there. You have to work the ground, even just a little to help the seeds along.

I have been working on planting many Iowa natives to replace that alien creeping charlie that has taken over my front yard. Some are meant to be aggressive as I do not care much for grass either. One area will have up to three feet tall plants, but other spots will be very low growing and foot traffic tolerant.

I looked at Arenaria and found there are some species native to your area. Scroll down to see the little range maps for the various species.
http://plants.usda.gov/core/profile?symbol=ARENA

Here is a link I shared on another post here for Washington native groundcovers:
http://www.wnps.org/landscaping/herbarium/evergreengroundcoverlist.html

Because of some plants' ability to become invasive in their non-native habitats (no natural controls), I try to encourage people to plant what is native to their area. There are so many interesting, little known plants that can do well in a landscaping/yard environment. I expect my plants to be eaten by little critters, but rarely have I had a case where an insect will decimate an entire native plant... the garden crops are another story. :) The natives will bounce back, even from borers that eat down a stem... the plant sends off side shoots!

This may not be the direction you wish to go, but I saw this has gone without a answer for a long time. I hope you have success with whatever you do.

Hi Shadowsong-
I live near you
I, like Chillybean, am not sure about the easy care approach you plan, but can comment on the plants.
The only supershort Veronica I have found to persist here is Veronica 'Georgia Blue' It seems very hardy, I don't think I have ever lost one. They spread slowly, and do not seem to spread seed around. It seems unlikely to outcompete grass, but maybe it would. It is on the "Great Plants Picks" list for the PNW.
Snow-in-Summer, Bellum, and Arenaria seem to desire different conditions than my clay, Except in one sunny gravelly spot where one Arenaria has persisted, all of these have died out for me. I think they drown in the winter sogginess.
I have also wondered about Irish Moss, but I seem to recall reading somewhere that in the PNW it requires a sunny spot.
Thyme for me is great on edges of rock walls, but dies off on flat spots in my clay.
Good luck, let us know how this works out.

Thanks for the comments!

According to the soil taxonomy for my area at least, I have gravelly sandy loam rather than clay, so maybe I'll have better luck than Pistil has been having.

I'll take a look at that penstemon from Chillybean's link, and maybe consider putting in a little more effort than "absolutely none" to nurture any seeds I put in.

See if you can find out WHY there is a bald spot! A rock underground? An outcrop of underground varmints? Somebody oversalted your lawn? Chuckl, Good Luck!