WaterMelon

If Water Melon is Green, surely the other melons shouldn't be classic Elemental Colours too.. Blue + Yellow = Green, and Blue is Classic, While Yellow is 1 primary shift to the left.

If Fire is Red, then Firemelon should be purple or Orange.

Brown, is a mix of all three, so EarthMelon should probably be Grey instead. (But then, would SteelMelon be Brown or something else?)

And Air was classically Yellow, So If FireMelon was Purple, AirMelon would be Orange, and vice versa (maybe purple suits air better?)

What about the insides? Red (fire) inside its opposite (water)Melon...

So, Firemelon should be blue, Airmelon should be brown, and Earthmelon should be Pale/Pastel.

Seems Legit.. (Is FireMelon Spicy? does Airmelon give you gas? and would Earthmelon be forgable into weapons?)

This, is the way my brain works when I see images like this..