One of my design goals for the family of Barcode Burr designs was to have customers be able to try all of the variations at minimal cost by being able to swap out the color coded insert pieces onto the same corner piece body components so as avoid purchasing so many duplicate pieces. If people want to have more variations assembled simultaneously then more body pieces (and attachment screws) are needed.

The "standard" color scheme that I've always used is with each of the 6 pieces being of the same silver-gray color which looks nice and makes for a tricky solving process because it's so easy to "get lost" however I also offer the "rainbow" color scheme so that people can color-code the pieces in order to make the solving process easier to visualize.