This list of ideas isnt' just JV ideas, but here goes...
You can go to an online printer offering free + shipping biz cards or post cards - I think biz cards cuz you you get more (vistaprint is always promoting free stuff). Design a mini-billboard promoting first time customer visit discount or free sample (get something from hair product rep as a giveaway or discount). Give 3 cards to each client, tell them to put their name on the card (part of card design will be a place for their name) and to help you build your business by giving these out. They get a free something from you or a discounted something from you for every redemption. Make it good! The lifetime customer value of a new client is what the referral is worth.
Get the emails of every client - put a big sign on the station asking for their email info so you can blast announcements. Then coordinate w/hair products companies for specials or clinics or events of some kind.
Buy a Facebook ad - contain it to your city, age group etc. Their demographics are precise so costs can be contained. It's NOT the Google network so you should emphasize that FB has their own rules of ad publishing and you should review them closely just to be safe, but the upside is you're not doing "traditional" keyword research. You're doing "tribe" research - demographics and psychographics. Look for local women's groups for placement, events that attract the clients you seek.
Next, join MeetUp in your town, business networking groups. Become a student of Direct Response Marketing and learn how to make your phone ring/your appointment book sing! Focus on building a list of "interesteds" and "clients" that you can email or talk to via a community (think Facebook Fan Page, not Profile Page)
Look for JVs with complementary service providers: Example = weddings would have you partner with church/pastor/judge, photographer, florist, baker, wedding gown retailer, tux rental, limo, caterer, band, etc. Put together a huge newsworthy promotion "$5,000 Wedding Package for $2,000" kinda thing. Have everyone give a discount, pay part of the display ad. Make it expire and only offer 5. Then blast out the announcement on every FB wall in your town where brides or bridesmaids would read. That kinda thing done 4 times a year could fill your in-house list pretty fast.
Finally - remember that Givers Gain - find a way to give away something to people who can't afford or can't come to a salon. It's newsworthy, if they're older they may have children to be introduced to.
Hope this helps, good luck