Oh shhh I'm so so sorry for your loss. I love your idea of a new experience to celebrate your dh and of creating some new traditions.
I don't know much about teenagers but 8 yo boys I can do (my 3 are 6, 7 and 9) here's my list of ideas from last year and this year in case it inspires. (I didn't and don't plan to buy all of these! Some are just ideas, others are ideas I gave/will give to relatives)
Stockings: swimming goggles/dive sticks, wallet, torch, Gogos/similar, spy glasses/pen, felt tips, puzzle books, shin pads, sachet of hot chocolate with mini marshmallows, funky water bottle, origami paper and book, Bear Grylls scouting book, Top Trumps, book of card games.
Bigger presents: Fifa 14 for the Wii, Blutrack (google it - looks great),
Extra marble run stuff, Raspberry Pi, Nerf guns, football match ticket, theatre/cinema vouchers, Monopoly, Forbidden Island, trivial pursuit (With kids questions), Hot Wires electronics set, Operation game (we got the Star Wars one), pass the bomb junior, Shut the box game, camera.
We always end up with loads of Lego, I always say they have enough but apparently you can never have enough 
I hope you all have a peaceful Christmas together.