Consumer Reports survey results on what people gave in 2011:
Cash, check, or gift card: 38 percent
Gift: 9 percent
Nothing: 54 percent
Total median value: $20
What Emily Post suggests: Give cash or a gift depending on whether you tip well after each service. Calculate based on the cost of one salon visit divided for each staff member who works with you. Give individual cards or a small gift each for those who work on you.