Last year, I fell for felt ball garlands while making this multicolored one for the windowsill. This year, I decided to go for the whole tree. All you need is some heavy thread, a large needle, a thimble and lots of felt balls, which I purchased here. You can tie a knot on both sides of each ball to ensure they stay in place, but if the thread is thick enough, they'll pretty much stay put on their own. I spaced them an inch or so apart, and it took about 160 felt balls to make it down and around a six-foot tree.