Easy Post-It / sticky note mosaics using free software.

Easy Post-It / sticky note mosaics using free software.: "I work at a non-profit facility with kids and have been looking for projects to work on with them that won't cost a fortune. One thing that caught my eye was the Post-It mosaic of Elvis that made the online rounds a little while back. That looked to be a perfect project that the kids could work on over time, and would certainly brighten up some unused wall space."