I recently finished these sailboat invitations. I think they're absolutely perfect for a baby shower, but they're so versatile they would work for a bridal shower or birthday party (or, or, or)!
They're available on my website here or at Bitsy's Greetings on Etsy here. They're shown here on linen cardstock, but I'm happy to print on a different type of stock. I'm just addicted to linen lately. Beautiful, isn't it? (Make sure you click on the photo to see the detail.)