DD is almost 9 and we painted her room pink last Christmas. She loves it and loves having her friends over to show off her pink room! We actually bought a 4 litre misstint from the paint factory, perfect and cheap!!
The lady also gave us a tip, if you need to undercoat, just buy paint in a lighter colour than the coulour you are going to paint, so we bought a very light pink from the misstints too All up, the paint cost us $20!