Don't want your ideas and creative work to be locked up for 90 years after you die? You could always put one of these stickers on your driver's licence (as is, apparently, the done thing for organ donations in the US).
Not sure how legally binding they would be (the most likely answer is "not very"). If you really want your scrapbooks of poetry and Garageband recordings to go to the public domain, you'd probably be better off writing a will. Or you could consider releasing them under a Creative Commons licence while you're still alive.

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