Green Lantern's round construct he created to transport team members through space.
I always thought a "deluxe" GL pack that included a mess of translucent green constructs like the hand that comes with the recent GL single would be great - a shield, a platform, weapons, snap-on armor, handcuffs, a big half bubble (so completists would have to buy two to make the full bubble), etc. They could then repack them yellow with Sinestro, pink with Star Sapphire, black with Shade, swirly colors for magic users, etc. I'd buy a ton of those.
That's actually a great idea! Also I would think Viglante's bike would be a no brainer. They made one for Batman, Green Arrow, Green Lantern, & The Flash? Never understood the Flash bike. He needs a Flash van!