Become soil when you die
I would prefer to be reduced to useful organic matter than ash. It’s a little gross to think about, but also have you ever scattered ashes? Actually gross. Chunks.
Otherwise being electolocized or whatever clean and used in artwork like an ossuary would be cool. I don’t think they let people do that anymore though.
Probably neither of these can happen since I signed up as an organ donor 🤷♀️ But best of all would be to save a life (or make someone’s life better) with my death.