I found this fly referenced in Dick Brown's book Bonefish Fly Patterns and on several blog's online- specifically the excellent DIY Bonefishing Blog. Greg's Flats Fly was created by Greg Miheve. The calf tail claws make this pattern stand out. Don't go on your next trip without several in your fly box.
Materials to tie Greg's Flats Fly can be found here: Greg's Flats Fly Materials
