I too don't want more "stuff," but what matters is what makes us as individuals happy, not judging. Lots of interesting ideas up thread.
My treat will be to buy savoury food I don't usually buy or eat as out of usual price range. As I'm not keen on traditional c mas food will be raiding M n S for deli items, a decent bottle of wine not usual wine box, some posh ground coffee instead of the standard: and the de luxe item, pop into waitrose fish counter for undyed smoked haddock. I like twinkly lights too and will keep the heating on all day!
Maybe some luxury items in the food bank boxes?