This is an illustration from my Pax Romana series, which you can find here: http://giantessworld.net/viewstory.php?sid=3856 And believe me, in the story, the gladiatrix uses one of those columns for exactly what you'd expect.
I did make the collage. The backdrop is from the movie Gladiator. I forget who the model is, but she posted photos online specifically for use in giantess collages.
