I love Modge Podge and the look of decoupage done well! What a great idea for an engagement/wedding gift! Get a wooden letter paint it black use Modge Podge to glue the pictures then finish up with another layer of Modge Podge!
Use multiple frames and objects to create a larger shape like a square or rectangle. Maybe start with edges and fill in toward the middle. Incorporate the refillable frames into this gallery? In bolder colors than the other pin. entery or in living room