This took about half an hour. I just cut out the rose following my habitual doodling pattern, and it turned out better than I could have hoped! Yay!
There were holes and scratches on my wall, which have been annoying me for a year, but patching holes just wasn't happening. I happened to have some white shelf-paper sitting around. I've used it to protect walls from the artistic endeavors of small children in the past, since it's so easy to remove from semi-gloss paint.
Aaand, when I'm finally ready to fix the problem, all I have to do is peel off the decor.
If you're in an apartment, this is an easy way to fix up cabinets, walls ... etc. without painting. It really does come off easily, though I've always used it on semi-gloss paint, so you may want to test it on the surface, first.