Here's an idea that came from someone out there internet land and was mentioned on the Sky P3 coverage:
2 qualifying sessions. Half the cars are knocked out in Q1 and half go for pole in Q2. But the wrinkle is, it's one car from each team that drops out at the end of Q1. As gimmicks go, it's pretty gimmicky, but I think it would actually be pretty exciting. There would be no coasting through Q1 for the front-runners, everyone would have to go for it.