Beidh ceol, caint agus craic againn!
It's not surprising that Green Lanterns take their St. Patrick's Day celebrations seriously. Especially after Ganthet revealed that the Guardians of the Universe and the Leprechauns are long-lost cousins!
Unfortunately I don't know who to credit for this mighty gathering of the Green Corps and their Green friends but it was too much fun not to share. I picked it up on TheGreenLanternCorps.com forum thread from back in 2009.
DRINK RESPONSIBLY - DON'T WASTE BEER!