I only really have one thing of hers – a piece of jewellery that I can't actually wear. It's in a little box in a drawer. When she first died and my dad gave it to me, I went through a stage of being a bit obsessive compulsive with it...I couldn't open the drawer without opening the box and then being a bit ritualistic about touching it a certain amount of times. It became quite stressful. I have a couple of photos of her up with a bunch of others from my wedding...but it's too painful to consciously look at her.
Don't know if you're crafty at all, but when you were talking about this the first thing that popped into my head was "shadowbox!" - Esp. if you only have a few things, it might be really healing to work on putting those things together in some sort of something you can see.
My mum liked flowers and pottering in the garden looking at her plants. I have some flowers that she dug out of her garden and gave to us and then we planted them back home. They are flourishing!
This is a lovely memorial and way to honor her!