I put some tape pieces on D's hands and then his feet for him to explore. This, of course, was only done under close supervision.
Next, we added a parking lot. It was great fine motor practice for E to line up the cars and park them.
Then, I remembered this post from Juggling With Kids using cars to learn sight words. I adapted it to E's level by tailoring it to what she needs to work on currently: lower case letter recognition (especially the letters that don't look the same as their uppercase counterparts).