This is what happens when I mess around for laughs 'n giggles.
I edited two sprites of Machamp--one from Emerald and one from FireRed/LeafGreen, spliced them together (removed the left top hand of both Machamp sprites and switched the hand out, then reshaded that hand to match the sprite better. I forget which Machamp sprite was the base and which one "donated" the hand, but it was done in the interest of making the sprite have a more dynamic pose) and removed the head.
I took the head of Cue Ball (a trainer class from FireRed/LeafGreen) and stuck it on there, drastically altered the eyes to be bigger and less mean-looking, and changed the shading on the lower half of the face to remove the "five-o'-clock shadow".
I recolored the body of the Machamp sprite to match the head, and filled in the blank spot where the left shoulders were with what I thought the shoulders and neck would look like. When I recolored the body of the Machamp, I discovered that the Machamp body had one less shade than the head, so I turned the two lightest shades into the lightest shades of the head, and the rest of the shades into the darkest shades of the head. I then added the missing shade by using antialiasing on the body's skin. Admittedly, figuring out where the antialiasing was supposed to go was much easier than adding the missing spot on the left shoulders and neck.
Lastly, I took Machop's head ridges (I believe either FireRed/LeafGreen sprites or perhaps Emerald? I forget...) since Machamp's head ridges were too big for the Cue Ball head. I recolored the head ridges to match Machamp's head ridges and the Cue Ball's skin and added some pixels to finish the shape of the ridges, as well as adding some antialiasing to the head ridges (the Machamp's head ridges actually had more colors than the Machop's head ridges, even though both were from the same game).
The premise of the sprite was to show what Shade would look like underneath his clothes.
This was a test to see if I could simulate a rainbow with just four colors and dithering. I feel I succeeded, for the most part, except I feel that some hueshifting could probably improve it. Not sure what colors to hueshift with, however. I do know that this could probably never be done on the NES if only because the colors aren't from the NES Palette. I'd have to redo this if I wanted to see if that could be pulled off, but this is at least proof that you
can make a rainbow with just four colors.
This also means that if you used those four colors in Nintendo Swapnote, you could make a rainbow in it, too (those colors are available in Swapnote, but three of those must be purchased from the Lesson Store, I think? Not sure if the red is still a free download...if the red isn't still free, it'd be four colors that'd need to be purchased).