I love, love, love this attic bedroom by Jessica Helgerson Interior Design. It's the perfect secret hideaway: rather spare and basic, but with plenty of little comforts like the giant beanbag chair, bookshelves, and shaggy handmade rug. The bed being low to the floor makes it feel like a permanent sleepover, and the chandelier keeps the interior from feeling too camp-like.
Photo from www.jhinteriordesign.com. Project: Glamorous Four Square.