Glow in thge dark things are so fun. When i was younger i used to have glow in the dark stars on my celing in my room and at a shop in the mall there is a glow in the dark cave. it's so cool but sadly it's only for children ten and under. *tear tear*
So, I had a few glow in the dark stars and stuff on my roof as a kid.
But I would love to fill my whole roof, with an astronomically correct star chart. Educational and bloody amazing! Especially if I wasn't in Australia, because there is nothing like the night sky at your home.