By Poravute / Getty Images What if all we had to do was paint our walls to generate electricity? Such is the promise of solar paints, which are capable of generating energy. These are largely based on nanotechnology and are being tested by several scientists around the world. What if all we had to do was paint our walls to generate electricity? Such is the promise of solar paints, which are capable of generating energy. These are largely based on nanotechnology and are being tested by several scientists around the world. While some put solar panels on the roof of their house to generate their …