Easy. "On collision with Sprite -> go to layout by name -> choose("layoutname1","layoutname2","layoutname3"). Use as many names as you need.
Great solution! now here is the hard way:
On collision with Sprite -> go to layout by name ->"layoutname"&int(random(1,500))
That will pick from anything named layoutname followed by a number between 0-501.
substitute 500 with the total number of layouts you have.