I am making cupcakes to sell at my sons school production of "Urinetown the Musical"

I wanted to decorate them with something associated with the play ,but am having a hard time thinking of something appropriate.

The play is about a water shortage and how the people are taxed to use the restrooms. I thought of water drops made out of something.  Any idea's 

Google it...I found a few links that may be helpful.

Some suggested boiled sugar, isomalt and piping gel!