Big+Huge+Labs

Big Huge Labs is an online photo service. Using this site, you can create all sorts of fun mini projects. You do need an account, but it's all free. You can create some of the following fun projects: Pop-Art Poster, Inspirational Poster, Mosaic Maker, Magazine Cover, Movie Poster, Photobooth, Jigsaw Puzzle, Hockneyizer, Letter From Santa, Photo Filters, Map Maker, Mat Maker, Pocket Album, Badge Maker, Trading Cards and much more.

I personally used the Badge Maker to create customized passes for my tech crew.

Here is an example of one of their motivational posters I made. Took about 1 minute to do. And it's fun.