What are some really good Craft/DIY projects I could do for me and my sisters room?

Cliff Jacoby: I'm 23 now and loved what my mom did for my bedroom when i was in highschool, she bought some latuic from a garden store (ace or homedepo) then bought some fake flowers (walmart) and some butterflys (which you can even make out of panty-hoes, metal hangers and some glitter) and made a little butterfly garden for me. it was great and between 14 and 18 its not totally classified as childish. I loved it. Good luck!