My older two boys share a room and sleep in bunk beds. Since we moved them to bunk beds it's been great as it has opened up a ton of space in their room for quiet time away from the chaos of the rest of the house. I love bunk beds.
DIY: How to Install IKEA Bookcases So They Look Like Built-In's - lots of pictures and info on how this project was done, including how to allow for electrical outlets and mouldings - via Storefront Life
fill cinder blocks with a creeping ground cover like thyme which smells so good when walked on.-----good idea on a bank or berm; helps keep weeds to a minimum as the thyme (or other groundcover) spreads and hides the cement.