One idea is to use a necklace that has the black rope and some kind of charm or pendant or shell or whatever on it. Just wrap it around the hair and put the charm through the rope. It holds in place due to the texture of the rope and the charm decorates the hair. This is great to use because the hair is not tied tightly, it is actually nice and loose, but as I said, stays in place. You can also use decorative shoe laces to loosely tie and finish off with a pretty bow.
Do you know someone who knits?? Instead of a tam, my mom made me a really wide bun holder and fed yarn around the edge of it so I could tie it closed. Put your hair in this and then tie it closed, You can get these made in different colors to go with your outfit, I just had brown for my brunette hair.
You can even use a plain shoe lace tied loosely, and then use a beautiful lightweight scarf to wrap around that. If you go to a local thrift store you can find many. The one we have near my town sells them for $1 and must have at least 30 on hand at a time. So you can match them up to your wardrobe for work.
Just look around your house and see what you think might be cool to use, and or professional too.