Well, I don't have time to do it tonight, but maybe in the near future. In the meantime, here are a couple of links to some Irish/Celtic legends that hopefully might inspire one or two of you to DIY something for your games.
Good old Encyclopedia Mythica, a great website for brief rundowns on lots of mytholgies. Here's their page of Celtic Mythology articles.
Here's another site that looks nice that I found with a quick Google search. (link goes to their monsters page, there's more than just monsters on the site)
Happy St. Patrick's Day!
*I was thinking of doing a post complaining about the idiots on Facebook/Twitter who think the earthquake/tsunami were God and/or Fate's revenge on Japan for Pearl Harbor. But really, I only need to respond to those idiots with two words: Hiroshima, Nagasaki. Plus, that's got nothing to do with gaming.