Joker and Harley Quinn fill-in-the-flags
Why not put what ever you want on their flags? The other version of this was a wedding present commission that had her with a veil and them both wearing rings while the flags said "Just Married" on J's and "Forever" on Harley's.
Check out the copy I got signed by Mark Hamill!
I also gave him his own blank copy. Sometimes I wonder what he did with it.