Good to see you are doing it again!
Other decorations i can think of are those peel-n-stick things for windows. The static cling kind. I think that would be the finishing touch. I can't remember if your deer was animated or not last time, but my neighbour has one of those deers where the head goes up and down. Maybe you can speed it up so that on the hard hitting notes of the trans. siberean orchestra it's head goes down real fast like some rock-n-roll junkie bopping his head.
Also if you are need of a cheap amp, the one I use in my car is $13. Sounds decent to me (I got mine on eBay though): http://www.electronicsbonanza.com/co...dProduct=11933
Good luck and hope you post some awesome pictures and video like last year.