(Please, ask your account executive for many more examples and promotions relevant to your business)

Ace.edu offers $200 in cash or in gift card when a student gets his/her friend to sign up for course
Lisa Hoffman Skincare is offering a referral special where users will be able to get a Free Spa Lip Moisturizer (value $34.50) when their friends purchase any item over $10
Serena and Lily lets you share $25 off discount with friends and if the friends make purchase then you get $25 credit in your account with them
PsychicSource offers 10 bonus dollars (loyalty points) to existing customers whenever their friends become member of its community (purchase psychic reading services)
Dream Worthy Gifts offers 25% discount to your friends and 40% off coupon to you when your referred friends shop at its website
On order confirmation page SWAK Designs asks you who else might be interested in the product you just purchased and offers 10% cash back if any of your friends purchase the same item
Numbr is running an iPhone sweepstake contest where you get one entry just for referring friends and one additional entry for each unique referral visitor you get
Anu-Skin.net uses NextBee referral tokens and referral widgets to offer $10 to users when they get a new customer to make purchase either through website or placing an order over the phone