One of the easiest ways to help kids remember what a letter looks like is to make it into an animal. When my kiddos were little, they loved the LeapFrog videos with the dancing letters that sang about what sound they make. In fact, I single handedly give credit to them for my daughter learning her sounds! :)
So here is our version of an "L" is for Lion:
Simply cut out a large letter L out of brown construction paper, then cut out the "details" shapes...legs, tail, ear, and mane out of orange or yellow paper (be sure and fringe the mane so it looks like hair), and a brown nose/mouth. When assembled, glue on the googly eye and draw the details on feet and face with black marker.