Here's a picture of what it looks like (from my old school). I haven't hung it up for this year yet. I'll do that on Thursday afternoon #lastminutelinda
Just print out the slips (feel free to use some and make up your own... it's a pdf due to my fonts but you can just toss the ones you don't want to use), put each slip in a different balloon (you'll need 10 balloons... unless you want to shorten it to a 5 day countdown), blow up the balloon, write a number on it (10, 9, 8... you get the picture) and then pop one each day!
Enjoy these last