I am probably pretty late to this but I just found FFFFOUND!
It’s a cool invitation only image bookmarking tool.
(If anyone has a spare invite I would be very keen to join)
“FFFFOUND! is a web service that not only allows the users to post and share their favorite images found on the web, but also dynamically recommends each user’s tastes and interests for an inspirational image-bookmarking experience!!”
There are truly some amazing images on this site: