Rubber bumper for Z3C (without front & back) topic

The Rhinoshield bumper being floated apparently was canceled due to lack of interest. Are there any other plain black rubber bumpers available? I have nice oleophobic screen protectors that I'm happy with and just want some padding/protection for the edges and to be able to set the phone face up or face down on a table softly. I don't want/need a case with a front and/or back on it, just the bumper. I guess any soft material (like silicone?) would be acceptable.