I would like to know the same thing. Mine's all been fairly low-carb. Not that I mind it that way, but it would be nice to play around with the carb level.
I've thought about bottling in beer bottles, capping, and letting them sit out an extra week or so at room temp. Maybe even adding a bit of priming sugar. But I'm still too new at KT brewing to know what the likelihood of making bottle bombs would be.