Change spell icons to help the color blind

There is not enough differentiation between the spell types other than colour. So selecting spell types in battle is difficult for the colour blind. Almost all other uses of colour in the game go with additional information to identify icons e.g. Troop level. How hard can it be to have a lightening bolt etc in the spell bottle

I like this. My cousin is colorblind and he hates bringing spells into battle because of this.

This would be nice. Any specific designs that you would want to see incorporated into the spell bottles?