Well there aren't a huge amount of colours in there. What I'm doing mostly is keeping the colour schemes really simple so I can use the slots for more subtle variations of each colour. I'm also experimenting in Photoshop with dithering which sometimes works and sometimes looks slightly messy. You can see that at the bottom of the wing bit on the AG one - there are just loads of varied pixels which makes the colour transition looks smoother than it actually is. But on the nose design, it turned out a little messy and lost the crisp look I was trying to get with the logo.

I'm inspired by Supersocks' Goteki to do something much cleaner so I don't end up with all the dithering next time.