Decorate cookies. Using sprinkles and remaining melted candy, decorate cookies.
Sprinkled Cookies: Prepare decorating bag with melted candy. Cut small tip in bag. Pipe line of candy around cookie. Immediately cover with jimmies or nonpareils.
Drizzled Cookies: Prepare two decorating bags with tip 1. Fill separately with remaining melted white and blue candy. On remaining cookies, pipe dots, drizzle candy or write messages in candy of opposite color (use melted white candy on blue cookies).
Chill all cookies until set, about 10 to 15 minutes.