I would like to donate my body for medical research, or even to a body farm (where they bury bodies at different depths, in different types of soil, to help with forensics). I really don't care what happens to my mortal shell once I am dead and I am adamant that my family should not spend a lot of money on an elaborate funeral. I don't want any religious ceremony and we don't even need a Humanist to officiate - if I die in NZ, which is likely, my daughter could say a few words, if she wanted. Then they could play some of my favourite classical pieces, just to set the mood, and cremate me. No need to sprinkle the ashes. I hope they use a cardboard coffin and borrow a van instead of a hearse.
Funerals are for the bereaved, not the deceased, but I hope my family know me well enough to realise that I would hate to think they had wasted money - they should use it for a wake.
I found the story of the woman with terminal cancer who had two daughters around the age of 18 and 20 very moving. She was arranging her own funeral to save them any stress after she died. How sad to know you would never be able to see your children marry, and hold your grandchildren.