As your hockey players develop stick control then you should be looking to teach them 3D hockey control skills. These are advanced ways of keeping control of the ball by flicking the ball into the air and over obstacles (such as the opponent's stick in match conditions).
These intermediate to advanced hockey videos show you how the 3D skill is executed and give you great training ideas for how to keep your trainings fresh - learning new skills to help them beat their defender in their next match.