Be creative. Use free online photo effects. You can go with a wall painting for a start.
Specially for the girls in the bridal mood.
Comic photo effect picturing Lenin and a daughter.
Photo effect where a cat and a kitten are looking at... well, it's up to you to decide what they will be looking at.
Photo frame Superman - a famous screen adaptation of the graphic novel about a person with a super power. Try this effect several times to be surprised :).
Interesting photo effect to play pranks on each other.