I made something like this a few years ago, but I decided to make it again, but using the new coding skills that I have gained since then. In this one, you have way more for sizes and colors. I remade the Scratch’s color selector to chose the colors, saturation, and colors, and to select the size, you can move a ball around, which automatically calculates the required size based off of distance.
My old drawing project from a few years ago. Scratch’s color editor.