Picking up a birthday present and need a card? Buy online at CafePress. We have a variety of birthday card ideas for all ages. From funny sayings, romantic to sentimental, we truly have it all. Shop for all recipients alike with some of our best selling greeting cards in the following categories: funny kid birthday cards, funny adult birthday cards and pet birthday cards. For really funny birthday cards, check out our best-selling humor birthday cards, which include someecards with funny sayings and quotes. Create your own greeting and personalize birthday cards with your own designs and photos with CafePress's Designer Tool. Greeting cards measure 5" x 7" and are printed on high quality, acid-free matte paper. Cards sold in single, 10 card and 20 card packs. White envelopes included.