Changes the colour of a pixel on the screen. colour is optional.
Built-in Colours:
black
silver
maroon
red
green
lime
olive
yellow
navy
blue
purple
fuchsia/magenta
teal
aqua/cyan
grey/gray
white
As well as using the colour names, you can use the number code e.g. 255 for
red (from 0 black to 16777215 - white. HTML colours are also supported
e.g.: #FF0000 for red.