Actually, I just finished collecting all 300 axes for my avi. Doesn't take long if you focus on it mostly while still doing normal tasks such as hitting a party, selling furniture, etc.
Actually, some players requested a way to get old avis so they're just trying to make us happy to continue playing the game.
I think Alice in wonderland was a good pick for Halloween hunt. I like the Ava's in the hunt and the furniture looks awesome!