1) A sunblock blaster on your door. As you walk out, it blasts your whole body with a mist of sunblock. It identifies the individual and blasts spf based on their preselected settings. 

2) Mist cooling zones under patio umbrellas. A very fine mist released to cool the area under umbrellas on very hot days. 

3) Waterproof projectors – to hide in a pool and project the silhouette of a shark swimming in the pool. 

4) Roomba for lawnmowing. 

5) A pool that notifies you if a child is in the water. Does so by measuring water displacement, calibrated to the weight range of children (20-90 lbs or so).