I find they work well if the rest of the sites design is minimal. Heres a list of wallpaper sites I like:
- The Pixel Patterns collection. User submitted patters. Bit hit and miss but more on the hit site.
- The Inspiration Gallery Wallpaper Patterns is quite an educational site on the origins of early, real wallpapers. Includes the famous Damask Wallpaper Patterns collection.
Well, thats about it so far. If you know any more, leave a comment.