Thanks to those who have offered alternatives but I've found out the new upload limit is just 10kb and my current one is 13kb so if I replace it, then later want to re-upload the old one I wont be able to. My super powers aren't supereroeroir enough. Fr4nk made one so fast it was hypersonic.
Tis easy, see here: http://homepage.ntlworld.com/ryszard.wrdelski/bit/ You need some image editing software that will import the GIF in frames and then put snow on each frame / layer... <-- My xmas FC.
I'm sure RTT could hax it for you I actually need a new avatar anyway, mine's a bit random right now.