Saw this on YouTube. It said 'If we have watermelon, then shouldn't we have earth melon, fire melon and air melon? THE ELEMELONS.'
Well, me and my friend (Rockypotatoman1) took it upon ourselves to draw the elemelons. I drew air melon and water melon.

The other two will hopefully be in their artbook.

(Update: Fire melon and Earth melon are now in Rockypotatoman1's Artbook)