I'm thinking neon balloons on the trampoline in summer:) Glow in the dark Party. neon colored paper cut into strips (to hang by black lights), balloons with glow sticks, she put black plastic on her walls
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.
Dress in all black and wear masks painted in glow in the dark paint for extra fun when playing tag, capture the flag, even football. Use different colors for different teams. Paint flags or balls you are going to use too.
DIY Glow in the Dark Nails. Pour the contents of a flow stick into some clear nail polish, paint your nails a bright colour and top it off with the glowing top coat. The effect will probably be temporary since glow sticks tend to fade rather quickly.