Recently, I began experimenting with a homemade system for diffusing flash for macro photography. This system probably isn’t as good as a system you would purchase, but it does a good job for almost no cost.
I usually use two speedlights in my insect photography so I made two of these. Take frosted white, plastic, freezer containers and cut a slit in them that will allow the head of your speedlight to fit snugly inside. Rig these up on your macro flash bracket and balance the ambient light one to two stops darker. I manually set my exposure (usually) to 1/200 sec at f/16 and then vary the ISO to balance with the ambient light.
The attached image is my favorite done this way. I’d love to hear what you think.