The colors are very nice, though.
The red is a true ruby red, the yellow is a butterscotch amber, and the green is actually teal. They're 12" diameter and 8" diameter.

I've seen them slumped in a kiln to make dishes, but really wanted to do something different with them. I can cut them with a tile saw, but as mentioned that takes ages and is messy besides.

The one really cool thing I got from that traffic light diving binge was a series of fresnel lenses. They're plastic, which makes them useless from making something out of them, but they can magnify and concentrate sunlight enough to make leaves spontaneously combust!
( The Resident Loon Not a demographic. Do not measure., Sun 6 May 2012, 8:18, Reply)