I know that when mars comes out there will be creeper eggs. It would be cool that if you mined the creeper egg, and collected it, and placed it in a good location or something, that you can hatch and tame the baby creeper, have it grow into a full creeper, and have it as a pet. I think this would be a great idea for the Creeper dens. I would just love this! maybe you could even assign a name to it, so a name appears above the tamed creepers head. Just something for fun.