Welcome to Lil' Duck Duck's collection of Photo Twin Birthday Invitations & Joint Party Birthday Invitations! All of the colors, wording & photo tints on these designs can be customized, and we can also change any of these designs into a single child's invitation (or any of our single photo birthday invitations into twin or joint birthday invitations, for that matter) or adapt a twin invitation for use with triplets, friends, siblings, or any other use that you need.