Trunk-or-Treat happened to fall on the day of our birthday girl this year. She wanted a birthday party and the other three wanted to go to trunk-or-treat. As you often do with a family of six, we compromised and decided to host a trunk that was birthday-girl themed. She was already heavily into princess-mode for her costume so the trunk plans quickly became a birthday castle. We needed materials that were temporary, easy to move, and not too expensive since it was likely to be a one-use castle. We had just moved so we had a LOT of boxes. Cardboard castle, here we come! Supplies: Cardboard boxes Heavy duty scissors…