What's the most fun way to use powdered sugar?

Put it in ur hand and blow it like pixie dust :)

Make icing sugar flowers or chocolate frosting.

Put it in ziploc bags. Put the bags in a carry-on bag. Go through airport security.

watch the fun unfold :)

Funnel cake

Sell it on the streets you'll get big cash $$ and try smelling them you turn Hi- Po

Designs on cakes and such.

rub it under your nose and take a picture and send it to all your friends.