I have a huge list of ideas for myself - whenever ANYTHING pops into my head I write in on my list (on my iPhone notes). The list runs all year, not just near Christmas.
My list has a variety of luxury-ish things/treats that I wouldn’t normally buy for myself, as well as useful things that will make my life easier, but again, wouldn’t normally spend money on. I also add in a few silly and nostalgic stocking fillers.
A few examples: Kate Somerville goat milk cleanser, heated throw, Olaplex, hair turban, few books/cookbooks, cherries in brandy, massive toblerone, crystal growing tree, usb candle lighter, fancy lip balm, fast phone charger or MagSafe charger, pjs, selection box, decent picnic blanket (my ex took his when he moved out and I didn’t realise how much we used to use it!), body scrub, fancy cooking ingredients, walking boot/welly bag (didn’t know they existed, saw them mentioned on another thread and I need to save my car from muddy walks!), pickle fork/grabber, board game to play with my child.
I don’t get everything on the list, I do go back and forth over it deciding what to finally buy! Then I just have to figure out how to pay for it all!