Random Endless Scrolling Background AS3
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I'm new to coding with Actionscript 3 but I know the basics and can create very simple games and such. 

I'm wanting to make an 'endless runner' game. So, I need a random scrolling background to act as the obstacles, platforms, ground, and background in general. It needs to be random though and not the same background repeated over and over. 

How would I go about this? Create quite a few backgrounds and use code to scroll between them?

I've taken a quick little look at tiles but I don't think that would be appropriate for what I am doing. I could be wrong, please correct me if I am.

Any ideas?