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I understand. Dealing with cart systems can be very time consuming, depending on how many products you have listed. Look at what your baseline keywords are, and then add the filters from there. For example, you might want to include "teddy bear"  if that is a more popular phrase in trends and keyword planner, then add your color filters from there. Make sure your product description gives enough detail to back up your page title. One other thing you may want to investigate. If you are using a cms, see if there is a plug-in or component available that marks up your product info in rich snippets automatically. This will help your listings stand out, while saving you a ton of time. Best of luck!