I can't believe people just leave loose bricks lying about unattended. You know you have artist brain when you get excited about taking other people's abandoned items home.
Today I taped up the sides of the brick with blue painter's tape and India Ink. When it dries, I'll add flower, bird, or dragon shapes with red acrylic paint. I'll either draw/paint over the black freehand, or use more tape to cut out a stencil.