Flickr has a "mark as favorite" function where you can collect pictures you like that other people post. I've been doing this, but I figure it's really almost a blog of its own, in a way. I've reorganized the links on my sidebar and added a Favorites of others link, so you can check it out from time to time to see what I've liked.
I'll try to set up some sort of feed-based thing at some point, but for now, go check it out! There's some good stuff there!