I haven't ever used flickr before, but I do have some pictures up on photobucket.
I looked up ugly - interesting search - alot of pictures were of "couch-surfing". I think that one thing that's interesting about Flickr (and many other sites) is the seemingly random creation of keywords/tags. It's obviously not really standardized at all, but in some ways I do think it allows for a more user-friendly search.
One of the pictures that I saw that I liked the best was :
I did a search for Coppell where I work and found a beautiful picture of a tree in a park - it makes me think of all the wonderful little things that I walk/drive by every day and don't even notice...