I never learned how to use the elipse tool; bezier curves seemed to make symmetrical elipses good enough while making 'off' elipses much easier. I'm learning inkscape now and the elipse tool is a little easier to use, so I'll let you know if I figure it out.



As for the colors, it's kinda up to you in a way; the show doesn't clarify, so the colors out there are fan-made anyway. I usually use someone else's colors as long as it looks right to me.