Thanks! It took a while to think about it and research them, but I designed them myself. (And then I was forced, _forced_ I say, to adopt them by one of the Irish heralds. I still have the marks of the trauma from the arm twisting. Well, okay, I don't, but Michael O'Cowan of the Chief Herald's office wanted me to give them a blazon of my arms for the roll of arms they were going to do for the 2002 International Congress of Genealogical and Heraldic Sciences held in Dublin that year, and when I told him that I wasn't armigerous, he replied that I was an American and I could adopt some. I'd been thinking about this design for some time, and had done enough research that I believed that they did not (and still do not) infringe on anyone else's arms. So these have been my arms since then.)
David