Try letting him sew with thread and needle on notebook paper a few times to practice straight lines, then maybe gift him with a bunch of 3.5" or 4.5" squares of all different colors so he can make a fast pillowcase? Then pick him up a few solid color sheets (also known as HUGE, inexpensive pieces of fabric!) at the local thrift store, and a pair of fabric scissors, and turn him loose. Playing with his ideas is the most important thing right now!