Do you even realize how far these wall stickers have come? It used to be simple shapes printed in monochromatic colors. Now you can get full color lifesize printouts of pretty much anything. Our son has a Major League Baseball player stuck on the wall to the left of his dresser. It looks like the guy is standing there for real! The first few days after I put it up for him it would actually startle me when I walked into the room!
Now if you do want silhouette types of stickers, they are available too. I have one of a dandelion with the seeds blowing off of it in our kitchen. It is white and the wall is painted with that chalkboard paint. The sticker frames the area nicely to accentuate the things we draw and write on the chalkboard wall.