I am going to go way outside the box here with a possibility that nobody has suggested,
but would be close to the ultimate poke in the nose to Ted Cruz - Rick Perry.
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I think Trump may well choose someone that can deliver one or more of the swing states.
Particulary one with a more electors.
Politico lists (as of February, 2016) the following seven states for 2016:
Ohio, Colorado, Iowa, Nevada, New Hampshire, Virginia, and Florida.
Perry - So the Feds can pay for his eyeglasses prescription? /jk. I am OK with him, I guess.