Super easy tutorial to build DIY Floating Corner Shelves... Each shelf uses only $40 in lumber. The braces are created using 2x4 and wrapped in inexpensive but beautiful pine boards. You can find the free plans and full instructions and tutorial at www.shanty-2-chic.com!
And if you're really looking to maximize kids' space, I recommend looking UP! Kids are so small. Do they really need 8" ceilings? Nah. Consider building in play areas or bunk beds if you live in a home and area that will almost always attract families (for resell consideration). Also, this room just looks FUN! Thinking maybe this is what we should do for boys room