The Constructo Weapons were a huge team effort. Designed to be 3 weapons (pistol, shotgun, bomb glove), each of which had three slots with three optional parts each. So, three guns, each one requiring the art for 3 assets plus a new custom shader and UI. Each one could be configured 27 different ways! Players loved these.
Here is a bit of the behind the scenes. Color map is grayscale. This is so that the player can choose the colors of primary, secondary, trim, and light colors. We also made and named some combos out of the box so players had quick choices that looked good (always a fear that when you let players make art in your game, that it'll be ugly and they'll blame you for it--see Bethesda's character creation systems and player whining). The super saturated map is the mask that told the shader where to apply each of the custom colors in an operation on the grayscale map to create the final color. Lots of work.