The top two boomerangs are unfinished, expirimental, omeqa shapes. Both work well. 
The bottom right is an omega or some call it a hat boomerang.This one has a hand rubbed oil finish, a forty meter range and is fun to throw. It is one of my favorites.
The bottom, left, boomerang  is a clone of the bottom, right, boomerang. It is a little lighter, a little floatier, has a 30 to 35 meter range, and has a lacquer finish.