Apparently it's called 'handfasting,' and started as an ancient Celtic tradition that was continued in Scotland and other European countries, but i LOVE the symbolism it states, and LOVE the choice of lace and ribbons in this picture :] (any religion it would have a nice meaning to it)
May you never steal, lie, or cheat. But if you must steal, then steal away my sorrows. If you must lie, then lie with me all the nights of my life. And if you must cheat, then please cheat death, because I could never live a day without you.