I was thinking about a NG human wizard, specializing in conjuration. The concept is still kind of rough in my mind, but here's what I've got so far:
His father was a (insert manual-labor kind of profession here, probably lumberjack). He was born with/contracted some form of disease/condition which causes his skin to crack and bleed easily. This made him tend to avoid outdoors, and so he spent much of his childhood hiding in wood piles, trying to avoid his father (who was disappointed in having such a weak son). He took up woodcarving as kind of a hobby to keep him busy while he did this.
Eventually his father gave up on him and sent him to the city, where he enrolled in mage school and learned magic. His condition had given him compassion for others' suffering, so he learned medicine as well, and became somewhat religious.
Appearance-wise, he's about average height, very pale from usually being indoors, brown hair, green eyes, but quite thin, and dressed very oddly: He wraps strips of blue cloth over most of his body, since normal clothes rub and chafe, which is bad with his skin (and that goes double for mage's robes).
Um, yeah, that's about as much as I've got so far. Does it look OK? I'll flesh it out tomorrow when I have some time.
I don't have the Eberron book, but I've been interested in the setting anyway so I may pick it up soon.