headlight referral card system

[Brite Nite]

What’s the best kind of advertising? Of course, word of mouth.
So what can you do to inspire more customers to refer relatives or friends? A referral program will help. Reward customers for any referrals, and it works better than just asking them to tell their family and friends about you.A simple referral system uses business card coupons.
On the front, print your offer. It could be $10.00 off or $10.00 to the referrer On the back, put “referred by” and leave blanks for your customer to put his or her name, number and e-mail address. Give each customer a few cards every time they come in. Tell them to fill out the back and give the coupons to friends and family.
Now guy's I am just brain storming on some ideal's so i would like your thoughts on this or your ideal.