By improvising a coach can replicate some of "todays" formations. I recommend recruiting a few WR's with good strength, above average speed and great elusiveness. Using the shotgun formation and positioning the pre described WR in the WR3 position you can replicate the "Pistol" and run an effective "Jet Sweep" by giving the WR3 100% outside run. Against a nickel or dime this can be a very lethal run offense and can compliment your passing game. The same can by accomplished with trips which also gives you the inside run game option.