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I don't know if you guys remember my "alternating polarization beam (APB)" idea I posted a wile back but that's my idea of a theoretical space propellant. If the beam worked then you could imagine 3 powerful APB lasers forming a triangle and in the middle all three beams would intersect and right below that area were the beams intersect would be a superconductor ship which would levitate on the beam's combined magnetic fields then all three beams would rise up at the same time taking the superconductor ship along with it all the way into space.

The idea of a laser driven space vehicle capable of interstellar travel was raised 25 years ago. The original article by Marx [Nature 211, 22–23 (1966)] presented a relativistic calculation that contained conceptual and numerical errors. Here the inconsistencies of the original article are corrected. Marx’s calculations are generalized to the case where the laser is of variable power, and to the interesting case where the laser beam is recycled by means of mirrors. The obstacles to this form of interstellar travel appear insurmountable, but the calculations provide an excellent example of the application of relativistic ideas.

That's my theoretical space ship idea. Whats yours?

Rapid interstellar travel by means of spacetime wormholes is described in a way that is useful for teaching elementary general relativity. The description touches base with Carl Sagan’s novel C o n t a c t, which, unlike most science fiction novels, treats such travel in a manner that accords with the best 1986 knowledge of the laws of physics. Many objections are given against the use of black holes or Schwarzschild wormholes for rapid interstellar travel. A new class of solutions of the Einstein field equations is presented, which describe wormholes that, in principle, could be traversed by human beings. It is essential in these solutions that the wormhole possess a throat at which there is no horizon; and this property, together with the Einstein field equations, places an extreme constraint on the material that generates the wormhole’s spacetime curvature: In the wormhole’s throat that material must possess a radial tension τ0 with the enormous magnitude τ0∼ (pressure at the center of the most massive of neutron stars)×(20 km)2/(circumference of throat)2. Moreover, this tension must exceed the material’s density of mass‐energy, ρ0 c 2. No known material has this τ0>ρ0 c 2property, and such material would violate all the ‘‘energy conditions’’ that underlie some deeply cherished theorems in general relativity. However, it is not possible today to rule out firmly the existence of such material; and quantum field theory gives tantalizing hints that such material might, in fact, be possible.

People, I am not asking you to come up with some revolutionary concept and this isn't life or death here this is just an exorcise for your mind for fun. All I'm asking is for you to think outside the box.

still nobody has posted an idea of their own or even one based on someone else's idea.