I've never quite understood the Lomo craze or the other toy lenses that have appeared from time to time, but if if you want to play with your m4/3 camera, Logography has a new Experimental Lens Kit you'll probably want to pick up. At US$89, it's not going to empty your checking account as fast as all the other things being introduced these days.
The kit consists of three lenses: circular fisheye, 12mm wide angle, and 24mm normal lenses. Each lens has a mechanical shutter in it, allowing you to take long or multiple exposures. Each lens also has a filter slot at the back, allowing you to do your Instagramming the old-fashioned way, with actual colored filters (a few of which are included in the kit).