Country Living's site has a few settings including this "Words of Thanks" Thanksgiving look:
HGTV's offer beautiful Thanksgiving centerpieces on its site.
Check out Pottery Barn's "Thanksgiving Table" inspiration page:
Southern Living's Pint-Size Pumpkins & Blooms (Now this photo shows an outdoor flower box but it can easily be done inside on your table):
(You can also check out the Southern Living web site has a two minute video with 100's of ideas:
I love the white pumpkins: White Autumn by Better Homes and Gardens