Just an idea
No pictures because I haven't done it yet, but somebody gave me a small strawberry pot with a partially broken side, filled with succulents. I have a low dry-stacked retaining wall fronting a sunny bed, and I'm going to take out a small section and insert the pot into the wall. I think I'll love it!
I also saw somewhere (lost it now, tho) a picture of a retaining wall where someone had taken a pot that was broken on one side, and built it right into the wall on a curve so the broken part was inside. It was planted with bulbs and succulents, some trailing down. Classy looking and a great way to recycle a broken pot!