When I was buying some props at a Walmart I came across the Nertz game that is put out by Bicycle. It’s got different colors of the rider back cards. These would be great for making color changing card tricks. The only downside is that these appear to only come in jumbo index.
and a funny little thing that I noticed is on the back it lists all the colors and which ones are new. It lists red as a new color?!
If you’re working on a color changing card effect, I think it’s worth it to pick up a pack of these!
-Louie