Or.... Supercell could have picked one of the several other colors to make the clone spell.
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I'd like to also state that lightning should be a metallic white color. Makes sense, it's lightning. It's time to clean up and refine this wonderful game.
1 in 12 men have suffer from color vision deficiency. If you do have this issue, be grateful. Most men that have it do not even know because it is not that everything is black and white like full color blindness. There is difficulty seeing shade changes. Most people will see yellow shift to green or white to pink long before I can see it. On my phone I cannot tell the difference in color between the freeze and the clone spells. I also cannot tell the difference between the heal and the jump spells. The heal and jump look so similar to me that I simply do not take them both on the same attack. I had less trouble when I played on my nook, because the screen was larger and i could see the background better. It is a real issue, don't dismiss it, simply because it does not affect you.
For this purpose alone, supercell should change the coloring of the spell. It's literally a one minute hotfix and it'll accommodate all of us, even the arrogant cretins who refuse to acknowledge this is an issue. I personally am not colorblind (at least I don't think I am), but the color difference is not great enough to recognize; particularly when you're in a tight situation and only have a fraction of a second to glance at your spells.
I agree with Op.
Icons are remembered by color first, looks second.
Just like the apps on your Phone, you look for the color blue for FB, and red for YouTube.
Making colors of a lot of spells / apps the same makes it look cluttered and more hard to tell them apart.