I recently saw a card in Papertrends that was so simple, but it just struck me as being very clean and classic looking. This is a twist on that card (sorry, I don't know which issue it was in!), using the SU! set Pun Fun. The only part that took any time at all was the paper piercing around the edge (which I 'stitched' with a Real Red marker). It's really difficult for me to come up with gender neutral cards, and I think that this one really works for either girls or boys.
Recipe: Stamp Set: Pun Fun; Ink: Classic Black; Cardstock: Gable Green, Real Red, Whisper White, Bashful Blue; Accessories: Watercolor Wonder Crayons, Aqua Painter, Real Red Brads, Slit Punch, Paper Piercing Tool and Template.