I know, I know. This is for sure the ugliest thing I've ever made. Anyway, here it is... Just a simple pendant with reversible faces. You can pass a cord through its ears and wear its happy face or its sad face according to your feelings, they are even stackable, just press-in one in top of the other. Or you can create a string of lots of happys or sads. You can even use it as a marker, if it smiles work done, otherwise pending. Or even to count positive or negative points, you decide. I have put a little hole into the eyes to be black painted with a sharpie and give it a cool appearance, feel free to paint its eyebrows, moustache, beard, makeup or hair and customize as you want, I kept it simple for that reason. Freecad sources included as usual, in case you want to modify/add something. Just let me know. Happy stringing!!