I loved LegoLars crocdile that I needed to turn it into a stich marker. One of the prints I used for a crochet stitchmarker with a lobster clip. The other one I did a smaller knit style with a ring. There is a little bit of stringing, I recommend using a torch or deburring tool for clean up. 

My jump rings and lobster clasps were from the amazon link below. Each used a jump ring, largest size for the knit style, the smallest one with a lobster clip for the crochet style. 

https://www.amazon.com/gp/product/B098PKGK5X/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1