A great example, the Refer a Friend page features the the previously mentioned icons. Refer a Friend is an incentivized opportunity for clients to share FOREVER with potential new clients to earn money towards their future purchases. Potential new clients receive money as well. This incentive is a win, win. Clients/potential clients receive emails that notify them of these earnings. I have continued the iconography throughout the header graphics of these emails as well.
Refer A Friend Email Headers
Website Icons & Imagery