Have been working on a "Morfa" type diffuser and it is working ok although I needed two layers of foam on the front to get the light even and that eats away almost two stops of light. Another problem is attaching it securely to the flash thats why I am looking for something off the shelf that works ...

Anyone tried one of the Graslon diffusers for macro ?

Design looks promising with a built in reflektor and the 4x6 inch flat model (4300F) might be good for macro if used close to the subject.