They have thousands of pictures and wallpaper, Touhou 或者 not! Just type a name in the 搜索 bar for a certain character and you'll most likely get 20 pages of 壁纸 and all that good stuff!
Now, I went a little overboard and spent quite a few hours on that site, but trust me, a dedicated 粉丝 would 爱情 it.
The site also includes another 流行的 Japanese company, Vocaloid, so don't forget to check that out, too!