variants and google advertising

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I have a t-shirt store.  I created my shop to show the main product graphic image and then have a drop-down to choose one of the 10 color variants, which is just a generic blank color image without the graphic.  I thought this worked well until I realized that google will advertise all the blank (without graphic) color variants.  I have over 180 products with more to add.  I can't create an image for each product's color variant to show what it would look like.  I don't know what to do because I have been told that I can't choose what variants to show on google.  This may be multiple questions, but I am so frustrated after countless hours to build my shop to now wonder if it will even work.

Please help with suggestions or what to do.