Pixel Colour Changing

@ego-lay_atman-bay for help with the switch colours in costume block.
@helicoptur for the colour [ ] block (not in use).
@sathvikrias for the JS ext.? block.
Everything else by me, @348663451y.
The drawing is a 1971 Corvette drawn by me. It happens to be my favourite generation of Corvettes. All-time favourite Corvette is a '74. Just fun facts. ;D