I have toyed with starting a campaign in which the PCs were gestault characters. Simply put they would be young gods in training, sent out into the world to not only learn about those that may one day be their worshippers but to solidifiy their natures. Their parents/patron gods chose them and put them together. They may not like each other, they may not want to do this, but the High Gods have decreed it be so. And so there they are. You can rationalize that they were stripped of many of their powers as part of the educational experianc and are thus left only slightly better than average, or else give them some additional abilites and a LA.