Circulating around Pinterest is a very cute snowman door.  I have searched and searched and searched for 1) the original post and 2) directions without any luck...SO I decided to recreate the door and post directions.  I had some, um, trouble-so while I am documenting how I did this-I have put some helpful hints here and there along the way.
First, You need cups.  I used plastic cups one size smaller than those red and blue Solo cups.  I bought a huge bag of them at Sams Club.
I bought 3 different size styrofoam wreaths at a craft store (Michaels).  They have flat sides and are 2 or three inches thick.  THIS IS IMPORTANT!  My little wreath was only an inch or so thick (it was all they had) and it caused major issues.  After the fact, I found a small one at Hobby Lobby that was the right thickness.

Next I hot glued the cups to the wreaths.
I glued around the flat part of the wreath first

I reinforced with masking tape (FYI-USE DUCK TAPE PEOPLE), 

then glued to the cups. 

I ended up with this:

I repeated this 3 2 more times and voila, I was done!!!

Except-I came in the next morning to this:

(In truth, this was the scene more than once-as I performed a trial and error emergency fix on Mr. Snowman--most of the time he fell apart on his own-but I am fairly certain at least once one of the older students played a part.  This was also caused by that thin wreath head-it gave me the most trouble. The thicker wreaths came loose but not much and oddly enough, the biggest one actually never came loose at all)
So I stapled every cup to its neighbors

and finally duck taped end to end and all around on the back.  Masking tape might work-but I had crappy generic doesn't stick to anything tape-so my advice is to get duck tape.  I ended up using black duck tape and you can't even tell-so whatever color you have should be fine.  
I hung him on Command Hooks.
I added cut out eyes, mouth and buttons...and rolled up a piece of paper for the nose...Added my scarf and: 
The finished door:
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PS-no stage of this took very long.  I spent maybe an hour putting him together the first time...and each fix was a few minutes in the making once I figured out what to do.  I would definitely do this again.
The kids-and teachers-LOVE him! (and I do, too!)