You could retain the grey stone feel by using a grey colour instead of one of the blues. You don't have to use only blues or only greys, you can use both.
I think the Minotaur looks fine since it's mostly midtones with just a little bit of white, but the columns stand out too much. In my edit, I think they're still distinct, but don't distract/clash quite as much. The white-heavy columns would work well if they're meant to be interactive elements, but if they're just background landmarks, I think they're too much.