The border is my somewhat free interpretation of patterns found in traditional Celtic art, and featuring images associated with Brigid and her homeland: anemone flowers (associated with the saint); hops foliage (because according to reports, Brigid was fond of beer); reed crosses at the corners; and of course some shamrocks.
The figure stands against a simple landscape of rolling hills. She holds a model of a church building, emblematic of her founding of an abbey. In her right hand she holds a crozier, emblematic of her leadership in the church. While the crozier today is exclusively associated with bishops, you do see it in some icons, old and new, held by a woman who was a prominent abbess in her time.
As for the sword under Brigid's foot--there's an interesting story there that I'll leave it to you to look up.
St. Brigid liked beer so much, she wrote a poem about it, which you can read here: http://www.minogue.com/brigid/prayer.php
I'm going to make this icon available as a print in the next week or so.
