Some lower-key alternatives to try might be to try a 1 on 1 with another woman or, if your hubby isn't that open-minded about it or you want to share the experience with him (I'm actually the catalyst for my wife and her partners--it's not a question of faithfulness for us, but what she derives the most pleasure from), then you might consider a 1 on 1 with him only watching.
Depending on your relationship, full swap between another woman and your husband might not turn out in ways either of you thought it would be when it's actually implemented. You might try and indulge in some fantasy role-playing first with him in the room (phantom girlfriend, for example) then move on to female to female contact while your husband pleasures you.
New Year's is coming up, so a lil kissy kissy to a woman you find attractive is an innocuous way to get the ball rolling on the stroke of midnight