One of the best ways to put a big punch of color on your board is a full fade. Keep in mind that a single color fades to a lighter shade, so red will fade to light pink.  And think of the rainbow when choosing multiple colors for your fade.  Fading red to orange to yellow totally works, but red to green would give you a muddy brown in the middle. Starting from the nose or tail, or even from the rails in, a fade is a classic airbrush technique that's as current as ever