It's not mail art yet but all it needs is an address and a cancelled stamp, so I posted it just for the inspiration. Although I would leave the three-dimensional flowers off, as they pose a risk to getting the envelope caught in the machinery.
DIY: Crayon Art Tutorial - using a blow dryer, melt crayons onto a canvas. Great way to use brokn crayons! This would be a fun addition to the kiddo's room! This would be a fun addition to the kiddo's room!