I can't leave this conversation about apps for sensory seekers without mentioning Toca Boca apps. They add a great combination of quality visuals with sound and touch capabilities. You end up with an experience full of sensations and delight.
Try the free Toca Hair Salon - Christmas Gift to get a feel for them. In this app, you can cut, color and put product in Santa's hair. He may need a beard trim as well. To top it off, you can us the blow dryer for a surprising effect.
Now take a look at all the other apps they have created.