Shine bright like a diamond... because you're a literal diamond
LifeGem will convert the carbon in your cremation ashes into a blue, yellow, red, green, or colorless diamond for prices ranging from $2,999 to $19,999, giving a whole new meaning to heirloom jewelry. If diamonds aren't your speed, you could become a pretty cool glass pendant necklace: My Sacred Ashes will blend ashes with glass in hand-blown pendants. Plus, there's a bulk discount if you order multiple pieces, meaning your cremains could become a fashion trend among mourners in the know.
Get pressed into a vinyl record
So you never wrote a top-40 hit in this lifetime. That's OK, because you can become one in the next. For 3,000 euros, And Vinyly will press your ashes into a 12-minute vinyl record. You can choose to play music, a vocal message ("I'm spinning... from BEYOOOND THE GRAVE!"), or nothing at all. Just be forewarned that if there's copyright infringement on your dead-body record, you're on your own. But hey, you're dead. So who cares?
Donate your remains to a "body farm"
The University of Tennessee's Forensic Anthropology Center includes a two-acre "body farm" -- a field of corpses where scientists, students, and professionals learn about decomposition. The paperwork to donate your body is all online and completely free. Another cool thing about this option is you can still donate your organs to people needing transplants. The body farm happily takes whatever's left.