Just thought i would post up an experiment ive done today. Ive made a home made diffuser for a camera with an on board flash. Ive just gone and taken some test shots with it and im pretty pleased with the improvment! Obviously it works on some pictures better than others, how close you are will make a difference ect. Here are the test shots and a shot of it on the camera 
It clearly makes the flash alot les harsh and flat which as we know is the downside to a poo on board flash
Without Diffuser
With Diffuser
Without Diffuser
With Diffuser
Without Diffuser
With Diffuser
It clearly makes the flash alot les harsh and flat which as we know is the downside to a poo on board flash
Without Diffuser
With Diffuser
Without Diffuser
With Diffuser
Without Diffuser
With Diffuser