I was casting around for a project to try with the laser and I hit on making a small balsa wood glider.  I came across this website with plans from an old issue of American Aircraft Modeler for two different balsa wood plains.  

These use 1/16" wood for the wings, and 1/4" thick wood for the body. The original plans call for a piece of each that is 3"x3' but I don't think you need that much wood. Anyway I took the liberty of tracing the plans they provided in inkscape and have posted them here.  I think this is ok since the plans are out of print and the page is already posted to the internet.  However the original author still holds the copywrite, so don't try to sell these.

I need to go down to the hardware store tomorrow and pick up some wood, but I think these will turn out good.