I think these Highway ABC Cards are so cool! I found them at makinglearningfun.com. You can print all of the letters (uppercase and lowercase) and they are available in numbers and shapes too.
Dr Jean (I love her!) has some other suggestions on how to use these Highway letters here, on her website.
B was only interested in driving his cars over the letters for a few minutes, but I’m going to try some of Dr Jean’s suggestions next. I just thought these were so neat and wanted to share!