I love this project idea! Primary colors and translucency look so good.
One thing you could do is just have loads of them going every direction, like that old pipes screensaver for Windows.
Otherwise I think you’d need rooms. The pipes are kind of like the roads of the city, and the rooms would be like the buildings.
But those are just my ideas. Can’t wait to see what you come up with!
(One note: the yellow elbow bend in the front seems to be losing some of its color to the reflection. IMO it would look nicer if we could see the yellow better.)