I bought a friend of mine an angel teddy, with a photo of her husband on last year
I agree with treading carefully because one person's taste is not anothers and this is particularly true in grief
I am recently bereaved (not a DH) and if some one bought me anything with my loved one's image on, it would really upset me. Personnally (just my taste and not criticising anyone who likes it as we are all different) I would find that angel teddy horrific as I don't like it at all and not reflective of the dignity of their life.
I would then be deeply deeply stressed and upset that I wanted to throw away something that had their image on and was in memory of them which seeing upset me. I would be anxious and agitated that deposing of something I hated and upset me to see at all would be disrespect of my loved one's memory and also of the donor. I also wouldn't want to just put it into the bin incase it was picked up by bin/tip surfers. So I would angst about how to destroy it - and would probably think I'd need to burn it rather than cut it up. Even thinking about this is upsetting.
I am setting this out here just to make the point that grief especially raw grief is a very sensitive time and what you think is nice may cause upset to the bereaved because of their point of view.
I would avoid linking it to the DH but if you are set on that and have an idea, float it gently by your friend making it very clear you are asking because you don't want to upset her and if (Eg. a tree to plant in his memory) wouldn't be ideal she should let you know. Even a tree or something to plant maybe too much if she isn't in a space to want to do the labour to plant it or look after it.
Personally I'd go for something comforting like a soft fleecy throw or something new for the house. a nice china mug of a good size.