I also made a door display of Minnie Mouse from Mickey and Friends. I used my 12 x 24 mat and cut it at Fit To Page. I got 2 sheets of black poster board from the $1 store for (wait for it) a $1.00 and cut it to fit the my mat.
It ended up about 18" tall. I then added all the layered pieces to the 12 x 24 with all the different papers and cut them all out at once. I love my Gypsy for that too. You can see exactly where to put the different papers at. That saved a lot of time. I did not even do any doodling or extra sponging. I never do that...... It was a last minute thought and minutes away from party time. But it was cute anyway.