This is the typography I've created for 'happy'. I made it 3D because I wanted it to look like the wooden toys that children play. I've also applied bright colours in each individual letters to make it look fun and appeal to children.
This is the typography I've created for 'sad'. I made it look swirly because I want it to look like dead branches. Also, I've kept the colours in dark hues to portray negativity. I use black colour for the middle letter to create contrast.