When you gotta go, go out like Spock did the 1st time. In a decommissioned photon torpedo. Or if you're not into the whole "irradiated dead body fired into space only to resurrected via the Genesis project and forced through creepy accelerated puberty while Christopher Lloyd hunts you down" thing, save them precious post cremation dust motes forever in a sweet Trek themed urn. No joke. I'd save up, but the price is TBD. Luckily, the cat urns are all set to ship. Go get 'em "Fluffy".
However, if you're low on cash or the kwatloo conversion sucks this week, you can simply opt to go out in a fucking cardboard box. The Green solution! (versus being buried in no box at all.) Styled as inappropriately as you wish. A bottle of wine? A hot licks guitar? Your favorite country? Some dolphins? Classy.