Some really good quality chocolate or wine. If they have everything then something non horsey is quite nice. If not look for something that is unusual but pratical/wearable, they prob have loads of stuff they dont need or use already.
I bought a voucher for our local beauty therapist and my yo loved it she booked in for a massage. I have got mine some personalised stuff and her favourite tipple
How about everyone chipping to cover for a day to give YO a day off ! - my lot did this for me last year and was the best pressie ever ! Fab - got to get up late - put make up on - normal clothes and went out for lunch and a shop followed by a threatre visit - Best day ! failing that some nice some luxury moisturiser for face / or hands. Don' forget some beautiful wrapping makes a small gift look fab !