A rather efficient and quite inexpensive flash diffuser I use for many things (portrait to macro-photography). I usually carry several in a pocket of my camera bag.
PetaPixel, DIYPhotography, and Photoblog.hk, all with permission, asked after seeing my post on Reddit for the first two, and seeing PetaPixel for the 3rd.
They all used my pictures, which means that none of them tried by themselves
The time-consuming part was taking decent photos⦠But since they are photo experts (much more expert and better tooled than I was at the time) it should be a snap for them