This blue & brown birthday thank you card design can be created as a flat single or double-sided card with even a postcard back for mailing directly; or as a folded card, with room to write inside (or to have a message pre-printed) & a matching design on the back. The inside of the folded card design can be left a solid color to write your own notes, or be pre-printed with a message. The back of the card (if printed on cardstock) can feature a photo of the birthday child at play if desired & we can customize the colors to match your invitation or party.