maybe do this as a wedding engagement invite. The front has the balloons covering the unknown couple. The inside has them holding hands with the balloons held on the side to reveal whose getting married! :)
Print your picture out on plain paper, Take piece of wood and coat with mod podge, turn picture upside down on wood press and let dry overnight. next day using water and your hands rub paper off of wood (your picture will be on the wood) now cover with more mod podge.