How Should I Decorate?? Ok, So my room has a theme of moons and stars and...

Ok, So my room has a theme of moons and stars and its taking us a long time to finish it. its from when i be in 3rd grade and i want to product it more "different", i guess. I have a pretty big wall that is completely insincere. It has an old fanlight that has drywall behind it from when my parents added an fixture onto our house. I was wondering if anyone had a pious idea to fill up the wall or what to do near the window? I was thinking big task force and gold stripes, or sections of paintable whiteboard. Also, i don't own a lot of light within my room, so nothing too dark. Any planning?? THANKS!!
Answers:    i added jonas brothers posters to my big empty wall, it looks soo good.


But if you don't wanna do that, i hold these polka dot wallpaper things that i put up and it looks really good.