I suppose taking only the first half of architectural history and discussing it with Cleopatra, who has only taken the first half of art history, I'm not really aware of depictions of God after, say, the Renaissance.
Now that I think of it, thinking of stained glass windows at church and stuff, we see pictures of Jesus, and sometimes the Holy Spirit is represented as a dove, but rarely is there any depiction of the Creator.
I suppose I've never really thought about how God looks, but it seems to make sense that as Jesus' dad, he's depicted as an older man...