This is my 3rd year and we've drastically built up each year. I started with generic halloween, last year did a lot of basic Halloween + Hollywood theme, and this year its a wicked wonderland. I'm leaving a lot of the black & orange stuff in storage in favor of the theme, but I figure I'll mix it up from year to year. I'll probably try to sell some of my Wonderland sspecific tuff after this party and put the $$ towards whatever comes next, but a lot of it is generic enough to apply to many themes - bloody black roses, black lights, etc.
First year it was just bon fire/food/drinks, last year we added shot luge, this year we trade that in for arcade DDR game. I figure each year I'll get some sort of "************** that is different, and I do like pushing the envelope to find something new and amazing.
This year I'm LOVING hearing other people getting excited about the party - every day I get a facebook message or blog comment of someone looking forward to the day, and that makes all the hard work (and $$$) worth it. As soon as I sent out the STD message back in March I had people saying "HELL YEAH, I WOULDN'T MISS IT" and that feels AWESOME