The instructions I got from the client were:
"Robust Space Marine-style boots made of foam"…
"…It doesn't have to be detailed, as long as it has the silhouette of a massive boot"…

 That didn't stopped me from adding allllll the details: talons at the front, horns on top (and on the outer side), spikes at the back, the Warhammer Chaos emblem, rips, straps, scales, heels, tracks.

I had also planned to add teeth, but it didn't really work, so I skipped that.