I most definitely am a Muggle, and I consider myself a Slytherin, with a wide Ravenclaw-ish streak. :-)

I wonder if Slytherin would accept Muggle-born witches and wizards. Obviously you don't have to be a pureblood to become a Slytherin (see Tom Riddle), but how pure would you blood have to be before you'd be qualified to become a Slytherin? And would other Slytherin-ish qualitites compensate the 'un-purity' of blood?