They have thousands of pictures and wallpaper, Touhou 또는 not! Just type a name in the 검색 bar for a certain character and you'll most likely get 20 pages of 바탕화면 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 팬 would 사랑 it.
The site also includes another 인기 Japanese company, Vocaloid, so don't forget to check that out, too!