I nursed my mum at home for her last six months so I've done this. Focus on what your mum will like/ enjoy and not on what you'd enjoy or think your mum ought to enjoy. In my mum's final weeks people brought all kinds of inappropriate items that were never used.
You know your mum. You know whether she's the kind of woman who likes to have smelly hand cream or a cashmere shawl or scent. My mum wasn't that kind of woman.
Some people take comfort from seeing photos of their loved ones and for others it's absolute torture, a reminder of all they're losing. I'd talk to your mum about what she might like and focus on making her as comfortable as possible. I bought my mum a couple of luxurious things — a throw and a very expensive dressing gown — in that end time and she knew, and so did I, that it was a kind of desperate attempt to pretend that the end wasn't around the corner and felt a bit fake. What she really appreciated was a very gentle hair wash and set every week. It exhausted her but she like to feel her hair looked nice.
I would be careful of scented products/ diffusers etc. If people are feeling nauseous or hypersensitive then scents can make it worse. The whole thing about scenting a room is that the people in the room very quickly get used to the smell and can't smell it. So your mum won't get much benefit from it.
Audio books, heated blankets, large pillows, a soft throw, a really comfortable armchair and leg rest, maybe a video player and some old favourite DVDs for the middle of the night. Later she might appreciate something to hold and squeeze and fiddle with: I bought a soft toy dog, around the size of a lapdog, for one elderly aunt and she just enjoyed having something to hold. You will find out what your mum needs as you go along.
Good luck to you all. This can be a strangely wonderful time.