Her color palette of blue and yellow already worked perfectly for this. In addition, nothing says french country to me like a mix of patterns, so we used a floral on the front of the card and a stripe on the back.
To get the vintage vibe they wanted, I used a combination of fun fonts and decorative ornaments inspired by old french soap and perfume labels. The border (used on both sides of the card) reminds me of a vintage stamp, and the two graphic frames (outlined in yellow) that contain the important text also help add to the throw-back feel.
Thanks for making my transition back to work after the baby so easy and fun, Rachel!
PS. Blue and yellow is such a beautiful, versatile palette. Click here to see some other wedding invitation sets I've done in this color combo.