There are many ways to get referrals such as getting your own domain for your blog, and then you can start typing down posts about CashCrate, then submit your blog to search engines. You can also make business cards and put them in places that allow them like at the laundries, some small stores, in gyms, colleges, universities etc. You can also join forums in which all you have to do is have your websites url in your signature and post frequently. When you get your check you can also show it to your friends and family and you can give them your referral number and get %20 percent of what they make! 

I got all of these tips from the CashCrate forum thanks to "biz2days", "briguy", and JustinNed"!!