I agree with the suggestion of the backyard for a PAF base.
As for single characters, I think it would actually be nice to have a mix of full size and a neat little base. Like, for example, with JS, I'd not give him a full size base with a background, but instead just the hill for him to stand on(TNBC fans, I apologize if this is anti-canon since I've never seen the film). A base made out of a landmark, if you will. I would give more examples although Jack is really the only character we know that seems to not have a play set so far. It'd be really tricky to size this out, however.
Also, I just have one question: how tall do you think these will tend to be? I definetly want to get them gradually, I'm just wondering if they'll fit on my current shelf.
By the way, best of luck with seeking a figure-crafting job.