Maybe you can hunt something down from one of these sites. I hope so.

Here is a link that might be useful: crochet doily pattern with shamrocks - Google Search

Here's a site that all St. Pat's day crochet stuff...

(This might also be in the google search Minnie listed, but just in case not, here it is!)

Here is a link that might be useful: St. Patrick's Day Crochet