I just started working on recycled plexiglas. The finished piece is mounted to a 1" board so that the clear frame shows through to the wall. The glass is 1/4" thick and I have painted on the back as well, so the colors shift as you move past the piece. Look at the detail shots to see this in action.
"The Evening Tide Appeals To The Tormented Sun" image size 8 1/2" X 10".