DIY Halloween Window. Save this for later! You wanted to see how it looked from the inside as well as the outside. So here is a little more information on how I created this fun Halloween window. I used a cheap frosted shower curtain liner, suction cups with hooks, and a projector with my laptop. I looked up Halloween Projector videos on YouTube. I used the Harry Potter version I found. It was free to use. I just turn on the projector each night at dusk. Such a fun DIY for Halloween. This is ver