I always loved the idea of a canopy or tent when I was a kid. The bottom bunk was always the best choice because you could use another blanket to create "a tent". I found a few canopy options so that if you don't have a bunk bed you can still have your tent:
Sarah Silks Play Canopies - $90
Ikea - $19.99
Camouflage Canopy - $10
I had a really hard time finding canopies for boys. I found a site that can instruct you on how to make one yourself.


















