What a tremendous gift, grannypiper! I second the suggestion of buying original art and a little holiday treat.
Depending on where you live, why not also take out a year's membership to a museum or theatre if that interests you? They range between£50-90 for membership plus guest and would allow you free access to all exhibitions. Theatre memebership cheaper and gives you priority booking, although you have to pay for tickets.
Have fun spending!
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