Green Black White Shamrock Saint Patrick's Day Coaster

Serve your drinks on these sandstone drink coasters with a great Irish shamrock. The background is white with a border in black and green. Although it is not clear what species the shamrock should be, the common wood sorrel or some type of clover, I chose the former. In this case the Oxalis acetosella. I think this plant looks much better than the common clover. Tradition says that shamrock was used by Saint Patrick to teach the holy Trinity. But there is no proof of that. In any case, the shamrock became a potent symbol for Ireland. And of course I use greens for the coloring. The font is Celtic style. The word seamróg is retrieved from the internet. So it must be right!