Bright green cupcakes with buttercream that tastes like watermelon! Add mini chocolate chips for the watermelon seeds! It could be nice to do the reverse red velvet cake w/ chocolate chips and green frosting.
BLACKLIGHT JELLO SHOTS They're a little bitter because of the quinine in the tonic water. You could easily swap Gin for the the Vodka, and have something close to a fruity Gin & Tonic. You must have a blacklight for these to glow.
MAKE GLOW IN THE DARK ICE CUBES? Mix tonic water with a bit of water and put in an ice cube tray. Put in freezer until frozen. Get a UV or blacklight. The ice cubes will glow because of the tonic water TIP use plastic cups for added glow effect