Check out Sophie's:
I really like the effect that this creates - and that's some beautiful ribbon you've chosen, Sophie! I don't know about you, but after tying bows using ribbon, the ends often fray a bit and I have to trim them up. Seeing how nice this looks, I think it would be fun to urge the fraying along and then the look is intentional.
No need to tell a joke, just give us a frayed knot ;)