Nope.

You don’t need drugs to paint pictures that look like a unicorn threw up all over the canvas.

Now, whether you do drugs or not isn’t really something that matters to me — your body, your choice what to put in it, etc., but I mean… for the sake of clarity: you definitely don’t need them just to make something with bright colors. That’s a very basic and conscious creative choice, not a magical art power unlocked through mind-altering substances.