This is an old site but maybe some of you haven't seen it already since it's in Japanese... It has the most FANTASTICALLY BEAUTIFUL Ban x Ginji pictures I've ever seen! 
The link below goes straight to the pictures menu page. For those who can't read Japanese the link buttons are the super-tiny squares at the beginning of each line - just click on them and you'll see the pics. The first two or three are doujinshi pages, the rest is wonderful, wonderful illustrations. Almost all of it is Ban x Ginji but there are two or three Kazuki and Fuuga pics.
Here's the link:
