Variants of Melons and Pumpkins (Purple Melons) (White and Green Pumpkins)

I think it would be cool if melons and pumpkins in Minecraft had different colors. In real life melons can be purple or even dark green. And pumpkins can be white and yellow. I'm not asking for the item drops to be different when you pick it up but simply a change to add some variation and realism to these blocks. It also provide players choices for decoration when using these blocks giving incentive to find certain colors they want encouraging exploration similar to wanting a specific parrot color as a pet. Some colors of melons and pumpkins could be rarer than others as well. Just an idea I have for the game.