Interesting images. Fruit stones are not the only foreign bodies that can cause secondary bowel obstruction (or even perforation in the case of fish bones)!

Of course they can cause bowel obstruction. However, maybe the more correct term is “phytobezoar”. I had a cause with multiple "stones", that even in the presence of bowel stenosis due to cancer, do not caused ileus:

http://www.bjs.co.uk/details/media/960009/Small-bowel-phytobezoars-in-caecal-cancer.html

Impressive image via @Alexander of the bowel obstruction partly mediated by dozens of olive pips!