Well, I had someone ask where they could buy shamrock seeds online, so here you go...

Irish Shamrock Seeds

Click here > Official Irish Shamrock Seeds

"No type of Irish celebration would be completes with out a few of the familiar shamrocks around. It blooms in white waves wherever planted."

LollysIrishGifts.com
http://store.lollysirishgifts.com/shamrockseeds1.html
"Shamrock seed is very tiny, about the size of poppyseed. There are Approximately 150 seeds per pack (measured by weight). The packet measures 3¼" x 4½". One packet contains enough seeds for a 4" - 6" pot."