Cryptic Points are one of the currencies in Champions Online. They are acquired per account by completing achievements, by promtions or by purchasing them on the Champions Online Web Site, any character may use these once they are purchased for the account. Cryptic Points can be used to buy Action Figures and Account Upgrades from the Cryptic Store.
There are several interesting things you can buy with your cryptic points. They dont really affect gameplay, it's mostly cosmetic. Costume pieces, heads, action figures,... Some of the more game-alterning purchases include more character slots and a character name change. You can do without, but if you got some cryptic points laying around, there's certainly something interesting you can buy with them.