If you're looking for better light using your on-camera flash, Photek's Softlighter Hot Shoe Diffuser Kit with Umbrella (60") fits the bill. You get a 60" umbrella with a white interior and black removable cover and a diffuser panel with an opening for your hot shoe flash and the umbrella shaft. A set of touch tabs for the flash head and a hot shoe umbrella/light stand adapter with an adjustable hot shoe locking plate for mounting the flash/umbrella to a stand are also included. This setup gives you a broad, soft studio-quality light using only a battery-powered "on-camera" flash.
Softlighter Hot Shoe Diffuser Kit with Umbrella (60")
OP Series Umbrella (White Interior & Removable Black Cover)
Diffuser Panel With Touch-fastener Opening for Hot Shoe Flash and Umbrella Shaft
Set of Touch Tabs to be Attached to the Hot Shoe Flash Head