This idea is from another website, Cricut Holiday. Go visit it. It's terrific.
For this super-fast, super-easy, super-adorable project, you'll need the following:
Some glass ornaments (find these at Michael's or Hobby Lobby... they are almost always on sale but you can use a 40% off coupon at regular price to make these pretty cheap).
An envelope to use as a funnel
Pledge Floor Finish with Future. I'm not sure what the 'future' is, but that's what it's called.
And there's no mess on the tree! Love these!