Sod that for a game of soldiers- it’s MINE!
Ha ha - yes of course it is - am I of Bank of Mum and dad in that if I really couldn't think of anything I needed or wanted I would squirrel it away for DC.? Probably 
So other suggestions Bertrand ( and these are not serious)
I have always thought one of the greatest luxuries would be to have fresh flowers delivered every week.
There is one piece of jewellery I would like but (Life dear boy ) other stuff always seems to take more priority , so I shall wait. And wait and wait 
Re a pp @TheWoollybackswife - DH and I spent what we thought was an silly amount of money some years ago on a great big bed - Best money we have ever spent 1. given how much time you spend in bed and 2. Just huge comfortableness ( is that even a word ) is lovely. Reading in bed is such a pleasure & a huge comfortable bed is great. But it sounds like you would have sorted this before now if needed.
An anecdote. A good friend of mine's husband sadly died ( illness where they knew he would - so they could talk about it ) She ended up without her husband but because of various things not worrying day to day about money. They both liked travelling and he had said to her , keep travelling because you enjoy it, even when I am not with you. So her "luxury" is that she does, but she uses the money to go business class. The amusing thing to me , is she will still get a bus to the airport and not spend money on a taxi. 
Everyone's idea of something lovely to spend money on is different. ( Voice off stage - "grandmothers and eggs" ) Exit stout party. 