We have been buying Rowmark Colorshop woods, which are pre-stained satin finish 1/8" plywood sheets. It is a nice product but it is also $15-16 per sheet, and that is adding up.
I would like to find a line of colorful stains so we can process cheap BB plywood and create something similar.
TransTint dyes look promising, it’s a 2 oz concentrate that you can mix with water, poly finish, or alcohol.
There’s this stuff too:
If anyone has gone down this road and found a product they like, I would love to hear about it.