I like this a lot!
Its a very good idea for a Gif.
Anything over 5MB may give you an error when trying to post it.
The next part of this challenge, new year celebration, I tried posting a Gif that was 8MB I think, and it rejected it.
So I needed to do some optimizing.
But I have seen still renders that have a high file size, and load very slowly.
I would think when CGCookie migrates to Mavenseed in the near future this maybe improved.