Wedding Cakes Gallery

Explore the galleries Brides.com
There are tons of images and a tool cake cake where you can build your own. http://www.brides.com/weddingstyle/cakes

For centerpieces, look at receptions or Flowers & Decor style wedding menu. You can also find tons of great photos of cakes and wedding facilities in the other albums were collected. Just go for it http://www.brides.com/albums.
Good luck!

I say google

theknot.com

Google gallery wedding cake thats what I did ... success

Yahoo has a partner site called Flickr is where people can share all the pictures. You use your information for Yahoo to connect and can search any aspect of marriage and take up tons of photos for examples. People are always proud to show their marriage and this site has tons of what you can get some good ideas!

Martha Stewart Living. com
Brides.com
theknot.com

the knot. com has a ton of wedding cakes and you can just do an image search on Yahoo's wedding cakes, and you get a ton, you can narrow your search if you know what color, flowers, etc.