Custom icons are icons you can make yourself. To make one, just go to settings, click custom next to your icons you get once you reach a point milestone, and click the squares however you want. But you have to reach 10,000 points to make a custom icon. The first color you unlock is black, at 10,000 points. The second color you unlock is orange, at 20,000 points. The third color you unlock is blue, at 40,000 points. I don't know if you unlock any colors after that, since my main account only got up to 150,000 some thing points before I deleted it. Since you only have 5,197 points, you can't make a custom icon.