As you may know, the spiky ('deepseacrab') crab model can take two skins. The creators intended this so that you can define a base colour (red, green, blue, black, orange) and a fluorescent markings colour (blue, purple or none). But someone (Clever Mr. Feasel I believe) discovered you can use other colours in the markings slot and get all sorts of cool and freaky combos. Hence some of the crabs we've seen in MoP.
Anyway, here's the full table. Click on a thumb to see the full pic.
[table=border:1px solid #CDBEE9; background-color:#DCFFDC; border-collapse:collapse;color:#35336F; padding:5px 10px;vertical-align:middle; text-align:center][tr][td]Skin1→
Skin2 ↓ [/td]
[td]None[/td]
[td]Black[/td]
[td]Blue[/td]
[td]Green[/td]
[td]Orange[/td]
[td]Red[/td]
[td]Ghost[/td]
[td]Biolucent Blue[/td]
[td]Biolucent Purple[/td][/tr]
[tr][td]Black[/td]
[td]

[td]~~~~[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[tr][td]Blue[/td]
[td]

[td]

[td]~~~~[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[tr][td]Green[/td]
[td]

[td]

[td]

[td]~~~~[/td]
[td]

[td]

[td]

[td]

[td]

[tr][td]Orange[/td]
[td]

[td]

[td]

[td]

[td]~~~~[/td]
[td]

[td]

[td]

[td]

[tr][td]Red[/td]
[td]

[td]

[td]

[td]

[td]

[td]~~~~[/td]
[td]

[td]

[td]

[tr][td]Ghost[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]~~~~[/td]
[td]

[td]

[tr][td]Biolucent
Blue[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]~~~~[/td]
[td]

[tr][td]Biolucent
Purple[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]~~~~[/td][/tr][/table]
Any moth body may also be combined with any wing colour. There are a number already in the game that are mixtures like these. Note that I've used the official skin names, which is explains why the "red" wings are actually green and "lavendar" is spelled incorrectly.
[table=border:1px solid #CDBEE9; background-color:#DCFFDC; border-collapse:collapse;color:#35336F; padding:5px 10px;vertical-align:middle; text-align:center][tr][td]Body→
Wings ↓ [/td]
[td]Beige[/td]
[td]Blue[/td]
[td]Cyan[/td]
[td]Grey[/td]
[td]Lavendar[/td]
[td]Purple[/td]
[td]Red[/td]
[td]RedWhite[/td]
[td]White[/td]
[td]Yellow[/td][/tr]
[tr][td]Beige[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[tr][td]Blue[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[tr][td]Cyan[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[tr][td]Grey[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[tr][td]Lavendar[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[tr][td]Purple[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[tr][td]Red[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[tr][td]RedWhite[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[tr][td]White[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[tr][td]Yellow[/td]
[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

[td]

Clearly some work better than others, but I've included them all for completeness.
They actually weren't all that hard to generate once I got a system of copying and pasting going
