Water bottle wall... could be a fun class project about recycling and could be used as a reading nook. Kids could "earn" the right to sit in the nook during personal reading time if they get the best grade on a test, earn so many points, etc. - Selenamarie318
Make a simple DIY vase using a plastic 2 liter bottle and an old CD. Neat idea. I couldn't find any directions for this though, so I'm not sure how they cut the design for the top of the vase or what kind of glue and paint would work best. I like that you can keep/make holes for water to drain very easily in these.
15 Easy DIY Ottoman Ideas You Can Actually Make Yourself