Created my own color picker box! You can click and hold to slide each color value up or down. Red, Green, Blue, and Material Alpha are adjustable. There's also an output on the side if you want to wire your adjustments to anything.
You can also shift all colors up or down, set to white or black, and click the color bars themselves to toggle the color fully on or off.
Round bricks of each material type are displayed to let you quickly preview how the color and material adjustments look!