If you're looking for better light using your on-camera flash, Photek's Hot Shoe Diffuser Kit w/o Umbrella (60") fits the bill: you get a diffuser panel for a 60" umbrella (umbrella not included) with an opening for a hot shoe flash (flash not included) and the umbrella shaft, a set of touch fastener 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. This setup gives you a broad, soft studio-quality light using only a battery-powered "on-camera" flash.
Studio-quality light from small flash
Diffuser, adapter, and touch fastener tabs included