I want to be cremated and scattered. I'd like to have my ashes fertilize trees and whatnot. I don't see the point in filling my dead veins with embalming poisons to "preserve" my body (for what?) and then sticking me in an expensive box, only to take the whole mess out and bury it. What a weird custom.
It sort of makes sense if you view it in light of the Christian tradition that says God is going to bring you back to life at the end of days, so you better make it convenient for him by keeping track of all your body parts. As if a God who could actually undo death is going to be all mad if he's missing pieces, like he got a defective IKEA kit or something. WTF. I'm fairly sure that the Catholic Church still wants you to get permission from your bishop before you cremate a dead relative. I don't know what happens if you don't. Do you go to hell? Does your dead relative go to hell? Are they barred from being buried in the local Catholic cemetery, which they probably wouldn't be anyway because you literally just cremated them? I don't effing know.
I don't particularly want an urn, unless it's one of those cardboard or cellulose ones that breaks down. Mostly I just want to be scattered out in the woods someplace that won't be paved over to build a strip mall in 5 years.