My df passed away a couple of months ago.
I had been planning to write his biography for many years, because he'd had such an amazing life; he'd lived through historic times and experienced some things that I wanted my dcs to know about and thought others might be interested in too. So when he died I was doubly devastated, because I hadn't been able to write this while he was still there (work or dcs always got in the way) and ask him all the questions I had, and share it with him.
I still wanted to write it after he'd passed away, but it was harder. And then we started to find box after box of papers (diaries, letters etc) he'd kept. And I realised how much of his life he'd left us. Which is incredible, if daunting (he was a refugee, so most of them are in his original language, which I don't speak).
A friend suggested I turn it into a PhD (my degree was in History) and I am feeling strangely comforted at the thought of my dad's life being properly studied and recorded.
I was wondering in what other ways you have memorialized your loved ones: plaques, setting up or giving to charities in their name, writing about them etc? Or if you haven't, how you would like to do this?