9 Must-Have Apps for Baby
5 Things You Can Do with Your BABY to Make it Easier to Potty Train Them Later | DomanMom.com...this is exactly how I potty trained Piper & Ever, except we also used a sign for going to the potty. Btw, Piper was trained @ 18 months & Ever by 2 yrs.
I loved doing this when I was learning how to read and write! Have the child say the individual letters as they trace them in the salt/cornmeal, and you're addressing all three learning styles: visual, auditory, and kinesthetic.