The square (diamond?) "Aurora" speakers supposedly use a machined aluminum baffle, per their sales literature, so I'm guessing the colors are just paint:
"The complete 45cm + 15cm solid aluminum end flare horn is assembled as a stacked ply construction, and milled on our 5-axis station, making the whole geometry possible as a production item to the required standards. The horn walls are not less than 10cm thick at any point, and the end aluminum section has 5cm thick walls, resulting in a true resonant free construction."
Considering the off-axis limits of horns and the large driver spacings I would be surprised if their larger speakers don't really sound good unless you are at least a good 15-20 feet from them, at which point room reflections would be a real problem to be managed compared to the source signal. Better have a really big mansion.