Yep, I used javascript but abandoned the idea since. So I would not be able to tell you how I did in details now… But basically I used Thumbnails Grid both for the grid AND for the Index and coded the style and modified the images sources using javascript!
Hi there, i solved it with the advanced Ajax Product Filter Plugin from rocket: https://en-gb.wordpress.org/plugins/woocommerce-ajax-filters/, because you can implement the filter as shortcut. Maybe this helps someone :)