I've been playing in Dragon Valley a lot recently (I think it might be my favourite store world), I've expanded and renovated a couple of lots that came with the world.
Before Pic in spoiler below:(Spoiler)
Brntwaffles frozen lighting mod is good for vibrant skies.
Also checking out Sims 4 to Sims 3 conversions of objects and CAS items might be worth a shot, Around The Sims 3 is good for this kind of thing.
@FabBunny google ‘Strangetown Sims 3’ and click a link that takes you to these forums, it’s a thread by the creator with pictures and the populated world! It’s all the strangetowns of the TS2 iterations put together.