Ahh, good ol' "Shadow's Christmas Carol". This story was to be a sort of crossover/parody of the Sonic The Hedgehog series with the story "A Christmas Carol" by Charles Dickens.
Basically the plot followed just as the original novel did, however with the Sonic characters (leading role of Shadow as Scrooge) in place of the characters in the story, not to mention it being a complete parody (mostly cruel death jokes actually)
This story never really made any real head-way in terms of being written, however the fact that it was a collab with my friends at the time made it a bit more special. The only true thing that remains from those days is the cast listing and various concept pictures that I was able to find.