Hand painted tree rings - would recommend putting all tree rings on a board (which could be painted a coordinating color to add pop to the art piece. Really neat idea for after school kids. Might just do 9 rings in a square frame!
12 Paint Recipes -Make your own paint using common household items with the help of these recipes! Plus this Chalkboard Paint 1 Cup of latex house paint or acrylic craft paint , 1 TBSP of non-sanded tile grout.
Keep your desk tidy by decorating your walls with pretty clipboards. Clip all those loose papers out of your way instead of leaving them to clutter your work space. A great alternative to a bulletin board - no pin holes in your papers! I clip boards.