Step 5: Painting/Staining
Hopefully you've decided between paint and wood stain by now. You should just follow the directions on your given product since they obviously will vary between the different mediums.
I decided to stain my Tetriminos, and found three different Minwax Wood Finish cans to do the job. The Tetriminos got divided up evenly between the three cans, and once I moved to a well ventilated area, were ready to go. It was kinda hard to take pictures of this process since my hands were somewhat covered in stain up until the end.
Depending on your proposed use for your Tetriminos, you'll probably want to coat them with a protective clear finish, or seal.