On Wikipedia, there's a page in the Community section that lists about 40,000 requested pictures
. Each photo (or image) has to either be licensed with the GNU Free Documentation License
or be in the public domain. Here's the official policy documentation
I was attracted to the Food & Beverage section
for some reason... I could contribute schmaltz
or ice cream cake
. There's so much on the list that there should be something for everyone.