Cut a length of half-inch metal pipe to a length equal to the desired width of your paint roller. Insert a length of wire through the pipe and bend the two ends together. Tape them parallel to each other to form a handle.
Cut a towel of the desired weight and texture for your roller to the roller's width. Wrap it around the metal pipe. Use a needle and thread to sew the free end of the towel securely to the portion of the towel already wrapped around the pipe.
Spin the towel-wrapped pipe to ensure the roller functions properly. Dip it in paint and use to apply broad swaths of color to your desired surface.