There are a lot of these to many to put here so I picked a few and thumbnail links to a few more, considering they are drawn on the ground the illusions are great

Very intriguing pics SuburbanSteve!

They had me doing a double take. Great talent in these artists, Thanks for putting these up!

Nice post =)

Made me a bit dizzy lol

I think it's just the same person: Julian Beever's Homepage (got the link from Miseria)

Very impressive illusion artwork.