Flickr mashups

This week's Vermont's 23 Things wants us to look at some mashups available from Flickr. I was certainly amazed at what one can make! I liked the "Catchy Colors Colr Pickr" site. I'm sure one could waste a lot of time playing with it. I tried uploading a photo but had no luck. I tried using a picture that was not copyrighted, but it wouldn't work. I'll try something else.