First, you need a stylish lamp. It will be functional, and will help you when you read a good book before you go to sleep.
A stack of books is also a nice decor. These ones are a universal solution for every place that needs decor, so you can use it here as well.
How about layering frames? It will add dimension to your nightstand. You can place a big one leaning on the wall. Start to layer smaller ones in front. Be sure to choose the right colors so it is cohesive.