Required by code for bedrooms, and a good idea for any attic room, is a window that can be used for an escape in case of an emergency. An in-wall rope ladder installed beneath it, hidden by a cabinet door, will give you extra peace of mind.
Knieschotten met plank bovenop. http://www.klusidee.nl/Forum/wand-onder-schuin-dak-slopen-t19166.html
Interesting and stunning Penny wall! Penny's applied to MDF while lying flat. Then covered with bar top epoxy for the gorgeous "underwater" effect. One wall in dinning room to accent rhetorically penny backlash in kitchen