Yeh rigging is no problem in maya also your pumpkin video isn't playing. I can see the thumbnail in the playlist though lol.That was just designed for making weapons, I dont think the Maya scene had a skeleton in it so you will have to make your own rig or use a prebuilt system like BIPED for 3ds Max. I dont use Maya much I prefer Max, if you want to make a walking mob then you can animate its actions in one direction and just rotate the skeleton rig to get its actions for another direction.
I would start of with something simpler for your first custom graphic, like a spell or mob that doesnt move (This is based on RME http://youtu.be/pBempg3kTvA)
Ah right so you made particles animate along those lines and spruced them up in after effects to make them look more icey?http://www.lomcn.co.uk/forum/showthread.php?62597-New-Spell&p=695865&viewfull=1#post695865 look at the screenies it sort of shows my workflow
http://www.youtube.com/user/ah111111 try that theres others too
yeh particles in Max and the lens effects were in AE (except fire and its glow/blur which was with FumeFX)