A small slug friend! Honestly I'm very sure I messed up at some point but it looks like a slug so objective achieved!!
The pattern can be found here and it's very easy and very quick. Use a colour-shifting yarn for even more fun, like the one I made! Unfortunately the site itself has been taken down, so that link will take you to an archived version of it. I'm considering copying out the pattern below as well, to make life easier. Does that seem like a reasonable option? Let me know if you have any strong opinions on the matter.
........feels like there should be more content here
oh well