This is really easy and an exciting way to countdown!
Hot Glue Gun
Start by Hot Gluing the TP Rolls any way you would like. I did mine in the shape of a Christmas Tree, but you can make yours square or rectangular or any way you want. As well as how many days you would like. I did 10, but again, your choice.
I got green construction paper (the Christmas tree) and another TP roll. I traced the TP roll on the paper and hot glued the edges of each TP roll. I stuck them on and numbered each circle with the number of days until Christmas.