I saw these on sfgirlbybay last week, but they're so good I couldn't resist re-posting them here:
{by Amy Jo. This poster is probably my favorite. I could see this being the design inspiration for invitations to a vintage-inspired wedding}
{by Kelly Munson}
{by Studio on Fire}
{by Ross Bruggink}
{found via sfgirlbybay, and you can read more about the poster offensive here and see this year's full portfolio on flickr here}