What to do for party favors?

if 3 people 3 beta fish , bowls pretty inexpensively.
if not want living thing them take home , have care make terrarium of sorts sand , cacti plants not require watering.
or art project getting several colors of aquarium sand, glass bowls or jars , make sand art. keep sand shifting , changing designs layer of wax gets melted on sand preserve it.
happy birthday...

i having birthday party @ giant aquarium place. there 3 people coming, can't expensive. want go along theme of sea life, underwater, beach.
turning 13 , girl.
nothing childish

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