I actually keep playdohs in a bigger quite air tight tuppaware. So packing up is easier, no need to try and put it back into little tubs. I used to be strict with mixing colours, but then i thought, why? It is meant for fun and explore. If there are big chunks in same colour, i might try to pull them apart. Big box means that you can just keep the art in it. Next time perhaps DS sees them wants to modify or destroy, so it is up to him.
I just bought a new popcorn making machine playdoh set, I think DS is finally starting to enjoy it.