I designed a very simple card using colors for a baby boy:
I purposely kept the card gender neutral in its design so that all I'd need to do is change out the colors.
Here's the baby girl card:
My Digital Studio does have a great printing service with reasonable prices, but since I needed the cards today, I lined them up on the right side of a Photoshop document and printed them on best quality on white card stock at home. They turned out great!
The nice thing about these cards is they are flat so I can mail them and not have to worry about having to pay extra postage. If I were giving them at a shower or something I could add real buttons and staples, though, to give it more of a three-dimensional quality.
I really do love how quickly I made these cards! Leaves more time in the day to play with my baby girl. :)