ToME: the Tales of Maj'Eyal

What i think. How about add themed (thematic) wear for players who donating and unlock Mirror?
It's look like a season wear (Santa's robe at Christmas time or Scarecrow costume at Halloween). This items'll be able to all created characters only after as player find it (for example - kill Nicolas at Santascape). And players cat transmog items and play with that whole events or in other time just for fun!

For example (master of paint):

This sounds a lot like a custom tile, but I like the idea as a neat little holiday thing outside of the item. Like a Clockwork Gnome Suit or something.

They'd probably work like the Kruk Cloak though, in that it's a piece of equipment mostly there for the shimmer.