DIY Digital SLR Flash Diffuser/Reflector made from recycled plastic milk bottle
Channel: HighPixels
Date: 12/11/2013

Possibly the easiest, simplest design that clips firmly to the camera. Performance is great, harsh shadows have disappeared from my flash shots, and my pictures look a heck of a lot better. This also greatly reduces the problem with large add-on lenses casting shadows when using the built-in flash. Brightness seems uniform, and colours looked slightly warmer on the shots I made. You can turn this into a 100% reflector by using black paint on the outside. You can also use coloured tape, glitter or anything shiny and colourful on the flash side to make some really lively pictures!
Disclaimer: Be careful with sharp knives, and don't put too much force on your pop-up flash when fitting the diffuser/reflector for the first time. Have fun!