This little fabric organizer is pure genius! It’s quick and very easy to make, and it simply slips in between the mattress and the actual bed frame. You can adjust the pocket quantity and sizes to hold whatever your kids like to keep close – books, teddies, gaming devices, you name it.
Source: http://www.diyncrafts.com/7285/organization/50-clever-diy-storage-ideas-organize-kids-rooms