Olympus OM 55mm f/1.2 converted to Leica M (with rangefinder coupling)
Yashica GSN Butchery
Yashica Lynx 14E Yashinon 45mm f/1.4 converted to MFT
Pentax-110 24mm on Panasonic G1
Lens Butchery!! Konica Auto S 1.6 converted to Micro 4/3
lens butchery!! Nikon L35 AF to Micro Four Third
DIY Carl Zeiss Lens for your DSRL or SLR 15 bucks... just an awesome idea. If like taking pics... this is worth the effort as its hard to get good glass without dropping major cash on camera lens.
Hacking the Yashica Electro 35 GSN - Adapted Lens for Micro 4/3rd's Panasonic GH2