When looking for cheap art for your kids room (or any other room for that matter), look no farther than your local home improvement store's wallpaper isle.
Most of these have samples that you can rip on your own. Find a wallpaper in the colors or theme you want and rip the section you want. (Works out great with themed borders as they tend to have a series of different images. ) Make sure to get as much of the paper around the image as you can, going as far as you feel needed in each direction. Then just find a frame and a mat (optional) to put it in. You can paste the image directly to the backer board for the frame so you know it won't slip.
Then just hang. Now you have art that was cheap, and you won't mind replacing when you want to change the decor.
* You can find more selection at specialty wallpaper stores plus they have open rolls of wallpaper instead of just borders so you can get bigger patterns for abstracts.
By lifewithmadman from Little Rock, AR