My go to gift for my grandparents or other elderly people in my life are heat packs! So easy and you can get most supplies off of Amazon and your local craft store. Search some recipes, mine comes from my grandpa who has now passed and I have what he left behind. I know he uses scents and never rice because mice and bugs will eventually find the bag and ruin it.
But recently I came across a cute picture of an antique cup on a plate that had a scented candle melted in it. The tea cup can most likely be found on eBay or garage sales, and it's easy to buy a bag of cheap tea lights and melting some in a cup until they fill it. It'd be cute to do this as a set on a tray.
Those are just two ideas though!
I'll be writing some DIY gift ideas tomorrow but there's already a recipe on my page for homemade Ferrero Rocher chocolate candies!
Hope this helps.