Pom poms on a can is so simple, but my son loves it!
Make some pom pom magnets: I bought my poms and little round magnets from Michael’s and hot glue gunned (yes, that’s a verb) them together. There is a tutorial about this at Confessions of a Homeschooler.
My son loves to stick these to our phonics tin cans (left over from my kindergarten teaching days). We have also just begun using some magnet pages, as well, but he doesn’t quite have the patience for those yet.