Do you have students who don't understand why articulation is important? Minimal pairs are a great way to illustrate how one sound can completely change the meaning of a word. Plus, this activity has been so much fun for creative minds! There are coloring sheets for a quick, no-prep lesson, or blank worksheets for your kids who love to think of their own silly examples!
I have created a series of worksheets for voiced/voiceless "th" substitution (d/th, f/th), frontal lisping of /s, z/, and stopping of /s, z/. There is a blank template at the end if you want to use the format but address different minimal pairs.
Simply print and go for your students who demonstrate these errors. Enjoy!