(question: i've seen all these activities and crafts using paint chips--are you really allowed to just take handfuls of paint chips from walmart or home depot or wherever? i've never even taken one...i have this paranoid fear that if i try the paint section workers will swoop down on me and demand in nasally tones, "Ma'am, exactly where are you going with that paint chip?")
so since i obviously had no paint chips, i made my train out of construction paper. (between doing stuff with the boys and teaching primary on sundays, i'm pretty sure i'm using up about a tree a month.)
we did this during tesla's focus time, and he looooved it.
as in, he finished it and asked to do it again.
and then again.
and cried when i said dinner was ready and it was time to put the "train" away.
he picked up on the idea of matching upper/lowercase fairly quickly, which surprised me. and the simple fact that i told him it was a train made it exponentially more fun.
every few matches, he would exclaim, "MOMMY! I make a train!"
conclusion: simple activity with a high repeatability factor.