We have decided to do this in my main, and it sounds like it's going to be fun. Even though the idea isn't too terribly original, it's one worth throwing out for others to bring up to theirs if they think it's going to be something fun.
Plain and simple, Linkshell Secret Santa. We are going to do random names, set a spending limit, and deliver the gifts through the auction house on a set date. Some ideas for gifts include crafting items, partying food or other consumables your favorite ls member uses on a regular basis.
Again, I know it's not too terribly original, but one most of the members in my ls seem to be wanting to do, so it may be fun for other ls's to do as well.