Yes, this post has been a long time in coming, but I was going through my stickies on my mac and re discovered my list of these beauties!
@InkyGoodness posted these on their twitter. From what I can tell, they held a beer mat character competition and a number of Illustrators have designed them. My personal favourite is the happy jellyfish one! They’re all linked to the original Instagram posts with the individual illustrators accredited to.