Origami Stars - I use these as part of a class positive behavior reward program. Students work to follow the expectations and be "star students". Once they fill up their sticker chart, they get to pick one of these stars which has a prize written on the inside. My kindergarteners love it!
This is cool because I think the design is simple. Also this one is very small so you can fold it up and put it in your pocket so it is very convenient. It could be folded up and it could also stand up and put the media player on top! This design could be used in any environment because it is simple and has one color, the color is black so it matches everything.