My little guy's favorite soccer "drill" is called Sharks and Minnows. Designate three players as sharks. The rest of the team are minnows. Have the minnows try to dribble the ball through the "water" and past the sharks. The sharks try to kick the balls away from the minnows. When a ball is kicked away, the minnow becomes a shark. The game continues until there is only one player left as a minnow.
Another fun game is called "Star Wars." Divide the squad into two teams, Yoda's team and Darth Vader's team. All players have their own ball and must "battle" the opposing team by trying to kick their ball so that it hits an opposing player's ball. If they are successful, the opposing player must pick up their ball and hold it over their head until a member of their team tags them.
Pirates of the Sea is an idea as well. Set up the field so that there is one cone in the middle, surrounded by three other cones. Have three or four players, without balls, stationed around the perimeter of the cones. The other players try to dribble their balls in and shoot at the cone in the middle, attempting to knock it over. The guards try to kick the balls away and protect the "ship."