Not so long ago i was doing a craft with some glitter and had a little bit left over. I couldn't imagine being able to fit it back into that tiny container, so it just sit on the counter overnight. The next morning Josh (3 1/2) and I were making playdough and it occurred to me to throw the glitter in. Why not right? If we had girls in the house, the special playdough no doubt would be called something like princess playdough or fairy sparkle playdough. Howver, Josh nicknamed it twinkle twinkle playdough. We love crafting and playing together and this was a little different which was a conversation piece in our house for some time! You could also add different essential oils or things to make the smell different for a change to the base recipe too.
In case you don't have a playdough recipe:2 Cups Plain flour
4 tablespoons Cream of Tartar
2 tablespoons cooking oil
1 cup salt
2 cups water
Put salt and water in saucepan and heat till salt is disolved. Add the rest of the dry mix and stir until it 'doughs' together.
I got it out and let it cool for a min or two after that, then kneaded it well.