I put together a DIY home made flash diffuser yesterday out of off cuts of correx, aluminium tape and duct tape.
All folds down flat, with polystyrene packaging foam clipped on the end for diffusing the light from the flash:
And I had quit a fun macro session today in a local woodland
Canon 750D with Sigma 105 f/2.8 and Raynox DCR-250 clip on lens.
100% Crop showing eye detail on Hover fly:
Although I think I may work on MarkII version, as I felt the diffuser stuck out too far from the lens, more of an issue when taking photos of insects in undergrowth etc.