You are using a compound key (item_id + color) but storing it by item_id alone. That won't work. Your cart is a hash, which means it won't store duplicates. Your add_item code checks to see if that item_id is there in the cart already before adding it, which will also prevent the same item with two colors from being added twice.
Frankly, this is so obvious that I think you must be asking a different question. Are you asking what a better data structure would be? I'd suggest you give each color a unique item_id, and create a higher-level entity (say, "product") to represent several items that are color variations of the same basic thing. Then your item_id will be unqiue and can be stored in the way you're doing it now.
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