* means I added it after the initial post
$$$ Pay Piggy $$$ ($10k / 100k points spent)
Custom Tele animation
Tradeable Pet Box of only unobtainable pets (hydra, etc)
Untradeable colored ancient staff with a spec bar (do dis please) ((it's literally just a much worse staff of the death), nothing close to best in slot, just good for practicing nhing in welfare))
Instant Tele from level 30 with !home, !shops, etc while in combat. (could be Diamond +)
Maybe can veng other every 15 seconds instead of 30 if that's doable.
55% Drop rate increase
Can !unskull instantly
Can !bank instantly after skilling
Option to toggle spawnables disappearing when you kill an enemy so that looting is ezpz
Sled
Triple vote points when voting.
Able to use presets interface outside of corp, and maybe a few other places if we can think of some
Custom yell / chat title, like how mods have "Moderator" and support "Support"
Tele over level 10 after dying instantly
100% spec restore when you get a kill ANYWHERE
*10-20 more preset slots
Diamond ($5k / 50k points spent)
Spec is restored in addition to hp and stats when a preset is loaded
Donator shop with untrades like normal santa outfit, dark santa outfit, elite achievement diaries armour, etc)
40% Drop rate in crease (should be increased from only 35%)
Maybe a slight discount when buying from the donor shop
*5 more prest slots
*Tele to target from safe (with a warning message)
Ultimate ($2.5k / 25k points spent)
Can use quick teles instead of !mdi (all things accessible through !mdi like !corp, !wyvern, !zulrah, and !obby could open up the "set-destination" interface , when an option is selected, you're instantly tele'd there.
Double vote points when voting
Some special custom tele animations that could be offered:
(can't find a gif, but the proper Mage of Zamorak tele animation, uses like a cool purple little thing) / seed pod tele / like the spin emote then just an insta tele
edit-
As suggested by @Rudra , making the achievement armor 5 available via achievements makes more sense than donator. I support this, but having some exclusive untrades like santa costume and what not would be real nice.