I try to be a laid back mom. Early in my motherhood days, I vowed not to care if my kids combined Play-Dough colors. This decision resulted in a Play-Dough box filled with this:
Our friend Sharon's visit to the Base, meant she offered to bring a few things from the USA. I asked specifically for Play-Dough, and she delivered as promised. We put smiley faces on the containers of "real" colors (and even threw away at least half of our green/brown mixed colors).
And while I will continue to be lax, I am going to attempt to at least encourage them to not mix -- in the hopes that we can make the colors stay original for a bit longer.