Obersvation - Social Interaction within Nightclub Dancing

The group decided on dancing for our motion but I don't see any significant way of using technology to re-invent dance moves so my approach has more to do with the social interaction while dancing. A common thread we all seem to share is the approach or denial of dancing with someone while at a club or bar.
Dancing is such a non-verbal action that even if one person is not interested in dancing with another person they typically won't verbally express it. It can take multiply hints of dancing away from the person or turning their back to them in order to discourage them from dancing with you. It is very rare that it will be verbally expressed.
So I thought if there was a way of communicating with each other while dancing without having to verball say anything that could help engage people or disengage people from dancing with each other.
Right now, I feel the best way would be some kind of lighting system that could be worn which could have three positions, Red, Yellow, Green. So if you had a Red light on, that means you are perfectly content in dancing alone or with the people you currently have around you. If the light is Green, you are open to people approaching you to dance. And if you have the light on Yellow, then you can send mixed signals which can be neither stay away or I'm open to anyone.
I would have to be obvious enough that other people could see it but suttle enough that it won't be terrible distracting.