Crawler
The basic idea behind this crawler is to get an asymmetric friction between the ground and the crawler. Namely, moving forward should be easier than moving backwards. This effect is achieved two unfolded paperclips which form a ~45 deg angle with the ground, so that moving in the direction of the paperclip is hard (the sharp end goes into the ground and makes moving harder) but moving in the other direction is still possible. The mechanical assembly is made of two whiteboard pens attached together via a flat mechano metal bar. The servo is positioned in the middle of the bar.
