Make a wipe-off weekly menu board in your room with a picture frame and your favorite scrapbook paper. To change the look for the season or to match your new room decor, simply just change the scrapbook paper.
Make a wind chime out of old keys and acrylic paint. - This site has lots of cheap outdoor/backyard ideas. I can't use most because I live in an apartment - but I love the old key to windchime and spray painted folding chairs.