Do you have a color guide? What do you use it for?

For a MOC that I'm working on, I wanted a gradient of blues. And since the colors in Studio are (understandably) a bit off, I put together a quick color guide. For starters, I just did the 44 solid, active, and "standard" colors from the Bricklink color guide (https://v2.bricklink.com/en-us/catalog/color-guide). I'm wondering if I should proactively expand my color guide, or wait until I have another use case. So I'm curious... 1) Do you have a color guide (with physical bricks)? 2) If so,...