DIY Thumbtack Christmas Trees - Step 1
You are going to need a lot of thumbtacks. I used 10 boxes of 300 for these guys. Since they are only $1 each at the Dollar Store, I would suggest overestimating. The small trees require about two boxes each. The large? About six. I just used a few styrofoam cones from Hobby Lobby and went for it one row at a time, starting from the bottom. Very very simple, however, time consuming.