I ran into this interesting search engine on accident. I put in 3 of my favorite subjects and it generated a list of other links to investigate.....If you are not interested in these subjects, put your own in and see what you come up with.
Another kinda cool site is this: http://karenswhimsy.com/ She has quite a lot of free clip art as well as some interesting sites of her own.
Lots of interesting sites to explore out there. I just love finding someplace new, don't you?