This is the behavior chart I use in my room and a parent explanation letter. I sent the single page of the behavior chart to the poster marker we have on campus and made a 2' X 3' poster of it and laminated it. If you don't have a poster maker, you can have one made at Kinko's or one of the big box office supply stores for about $3 I think. I hang it on my magnetic white board and use business card magnets with each child's name on it. I downsized them this year and only used 1/2 a business card size and it worked great.
As a class reward, I have a blank poster of a zebra without stripes. I had to draw this myself because I couldn't find an image of zebra without stripes. I have included a parent handout of how it works that I give out at Parent Night.