This year I used the Dr. Seuss theme in my classroom. The thing that excites me the most are my Truffula trees!
To make these I used Martha Stewart's Pom Pom's and black and yellow butcher paper. To make the stems I took the paper and cut a long, thin (5 inches wide) piece of yellow and a piece of black paper. I twisted them separately at first and then together.
Here are some other pictures of the room.
For open house, I had a balloon for each child along with a goodie bag and a tag with an "Oh the Places You'll Go" quote.