Dangle a shoe in a rhythmic way, play with an earring. Applying a tiny bit of lip gloss from a pot can be very flirtatious, but avoid powdering your nose, it makes you look old. The secret here is not in what you are doing, but in the rhythmic movements you are making. Rhythm is both sexual and comforting. Twirl your drink.
Pacing is very masculine, and if done in a steady tempo can be somewhat appealing.
It also allows a woman to ask why you are doing it. Whispers invoke fear and intrigue, and make people want to be included. You do need a partner for this technique, preferably one of the same sex, if you have your eye on another person. Now face in his or her direction but whisper in the ear of a friend. If they're close, they may even approach you.