Answer: Plant material (probable banana seeds)
Congratulations to everyone who wrote in - you all got this one right! Alasdair rightly said "Is that not just plant material? The beginnings of parasitosis of the delusional variety if it is. Advise the patient not to worry."
Salbrent went a step further and suggested "possibly banana seeds."
Anonymous Anonymous also commented "They resemble arthroconidia still stuck together. Is there a reference book for such things?"
There are a few references out there you might find helpful.
In my opinion, the best reference is the "Atlas of Human Parasitology" by Ash and Orihel which has a nice section on parasitology mimics and artifacts. These authors also have another excellent atlas called "Parasites in Human Tissues" which has a section on parasite mimics. These 2 atlases are a MUST-have for those interested in parasitology.
Another book that has some nice images is "Atlas of Microscopic Artifacts and Foreign Materials" by I-Tien Yeh.
Finally, here is a link to a short paper I wrote a while back that shows the histologic appearance of a peanut, blueberry, lentil, and hotdog: Pritt et al.