Luminous Blue isn’t available in metamorphic rock, therefore it would be painted or chisel changed… which means you won’t find large amounts of stock. You may need to buy paints at this stage.
Some folks do Goo farm and craft Spray it means you can repaint block by any color you want manually 1 by 1 or using a Spay tinter mass paint drag on your sprays and your block he do the job by himself