Portal-like visuals

I still didn't decide what to make exactly -- although I do have some vague ideas. In the mean time, I'm playing with Tiled and trying to reproduce the visuals similar to those in Portal's tutorials and ads:

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I already want to play this great work, also have you seen the new dlc map maker coming out?
That looks really nice. I love how your base map is 10x10 isometric tiles, just what I did :)
A good aesthetic to go for with this theme :-)
Portal 2.5D? Cool!

Could you include some "impossible" geometry (eg. Penrose stairs)? It just seems like an absolutely perfect fit for this sort of setting.
Just to clarify, I'm just fooling around, since I don't have a solid idea yet. And isometric graphics seems to be too hard for me, so I will probably ditch this. The idea is for the taking :)