Seems like it's a meme, now!
No, I don't wear green or orange today, 'cos I aint Irish.
(I don't identify as 'Christian', either but that doesn't bother me.)
My lineage is almost 1/2 Polish (with a Swedish great-great-great-grandmother in there somewhere), some French Canadian, some Welsh, and about 1/4 German.

About St. Gertrude of Nivelles-- she's a patroness of travellers and gardeners; you plant peas and potatoes on her feast day.
http://www.catholic.org/saints/saint.php?saint_id=3563
http://www.newadvent.org/cathen/06533c.htm

She's depicted with a mouse on her staff, and is sometimes considered the patron saint of cats.

Was looking up information for a patron today and realized I had no handy reference to websites and reference books on Saints. So here are my notes:

Catholic Online Saints & Angels: http://www.catholic.org/saints/
Patron Saints Index: http://www.catholic-forum.com/saints/indexsnt.htm
New Advent Catholic Encyclopedia: http://www.newadvent.org/cathen/ [out of date-- pre-vatican II]

From Internet Public Library listings:
http://www.saintpatrickdc.org/ss/ss-index.htm

For Medieval Saints, there's the Internet Medieval Sourcebook section on Saint's Lives:
http://www.fordham.edu/halsall/sbook3.html

Oxford Dictionary of Saints [at Drew, 270.0922 F233o 2003, Cornell Room]

EDIT: My boss points out that Butler's Lives of the Saints is the best resource we have in print to start with. [At Drew, in the Cornell Room, 235.2 B985ℓ 1995]

Fox's Book of Martyrs

Dumberton Oaks Hagiography database (8th to 10th century, Byzantine) http://www.doaks.org/hagio.html

I'm very fond of:
Saints Preserve Us! : Everything You Need to Know About Every Saint You'll Ever Need by Sean Kelly
and
Heaven Help Us : The Worrier's Guide to the Patron Saints by Clare La Plante
but both of these are more about folklore than hagiography.