Lisa~ Have you tried the 3M plastic hook thingies (I'm sure that's their name!)?
They are the type that you can remove without damage to the walls. I use them outside as well as inside, my neighbor uses them to hang her outside lights. You just have to make sure that you follow the instructions, so that they will stick properly. You can find these at Walmart, Target, anywhere really. You can always drill holes and put screws in and then paint them to match the background color. This way you can use them every year.