
Here's a list of books I've read that I recommend (they are all available at the library):
Blankets by Craig Thompson
Fun Home by Alison Bechdel
Stitches by David Small
Here are some links to articles about reading groups trying graphic works along with ideas about what to read:
No Honey... Graphic, Not Graphic!
Top 5 Graphic Novels to Get Your Book Club Started...
Going Graphic
And lastly, a link to award-winning graphic novels.