DIY Build in Flash Diffuser
buy a tiny lamp shade from any departmental store. Its those tiny ones for the socket.
Then attach them to your build in flash with velcro.
Compare the picture of my wife.
With DIY diffuser----DSC_0031
Without diffuser---DSC_0032
(I did not white balance it)
With DIY diffuser----DSC_0031
Without diffuser---DSC_0032
(I did not white balance it)