With the latest changes, the Builder tool allows picking the structure you would like to place from a list. This now makes it possible to build go-karts, roller coasters, humpty dumpsters and pavement!
customizable kbin color theme. use the panel with color options to select your colors. for better results, only change the horizontal color slider to change the HUE but keep the VALUE (darkness/brightness) the same so things are still balanced.
If you are trying to use a variable font in your custom block theme via theme.json, you may be running into some issues that I also saw and, mostly, solved.