This might give you some ideas:

http://www.google.com/images?hl=en&gbv=2&tbs=isch%3A1&sa=1&q=dining+room+decor&aq=f&aqi=g5g-m1&aql=&oq=&gs_rfai=

If the link doesn't work, search for Google Images, then search for dining room decor. You'll get lots of ideas!

I don't have a formal dining room; it's an open area with the kitchen and living room, so the colors are picked up from those rooms all around.