Avoid labeling this thought experiment as morbid. Treat it instead in the spirit in which it is intended.
When you are gone, what signs would you like to send back to those who loved you to remind them you're watching their lives unfold? Put aside for a moment whether you believe in a spirit or an energy that transcends our physical beings and answer this: What tone would your spirit or energy take? For example, would you want loved ones to know you're watching by playing pranks on them, say, hiding their keys in a place they wouldn't think to look, like, next to a picture of you?
Or, would you want your spirit or energy to manifest somehow via signs you send through the natural world, e.g., the orb of a full moon accompanied by a birdsong that you taught loved ones to recognize? Or, maybe your spirit or energy could hide itself in plain sight via an art form - music, literature, film? Even the most casual reader of my blog might guess this is my idea of an optimum way to let loved ones know I'm still here, sort of. Of course, this is assuming the choice is up to me. If not, I'd be happy being the prankster or signaling my presence via the natural world. Now that I've given you a few ideas, please tell me some of yours.
Anyway, although I'm planning on being around as long as possible, it doesn't hurt to give this some thought. And in the meanwhile, if I drop enough hints to loved ones while I'm still around, regardless of the tone my spirit or energy ends up taking, they could start seeing me everywhere. Good deal.
