If he's into his music, does he have any musical heroes who are no longer with us? When Syd Barrett (pink floyd) died, i got an amazing print and framed it for my brother. He was genuinely devastated and the picture meant a lot to him. Obviously it depends on his musical influences.
Mc Esher pictures are amazing, I have night and day in my living room (another framing idea).
Battery pack? Good backpack? A nice case of craft beer? (beer 52 do great offers and you can usually pick up the first case for postage. You subscribe but then just cancel. If this interests you and you can't find it free shout me, I may have an email to give you a code for a free one). There's are other craft beer subscriptions.
New wallet?
Emp is a great site for unique items which are niche - comic /musical /films etc.
Beer fridge sounds amazing or a smoothie maker if he's into fitness and shakes?
Retro sweet box.
Bottle of bourbon?
Does he use a games console and might need a new controller or controller charger? Gaming headphones?
Bluetooth speakers? Can get great compact ones.
Toastie machine? Breville
Are there any hobbies he's wanted to start or interests?
Dm boots?
Metronome?
Lava lamp