http://www.signgenerator.org/thumbs.htm
http://buy4cheap.brinkster.net/signs/people/make.asp?text=It%27s+Never+Too+Late+To+Do+Your+Best%21&fontsize=14&font=Comic&color=black&move=&move2=&cartoon=will-smith-fresh-prince
I really enjoyed creating all this stuff. I've been playing with it for a while. I uploaded a few of the posters I want to put around my room. Two are motivational, and one is to reinforce my rules. I don't allow students to go to the bathroom unless the students have a pass, but I still constantly have them coming up asking to go with no pass. This way, all I have to do is point at the sign. I see lots of ways to use this. I'd like to see if maybe there's a mash-up of FlickR photos that would combine with the sign generator or image generators.
Did you know you can upload a picture to FedEx.com and they will make your picture into a full color poster? It's a wonderful way to make posters for your class and your home, or flyers to advertise something.
Any other ideas. I'm off to look for more.