Here are some ideas that might come in handy to spice up your practices, besides always scrimmaging and running drills.
Small-sided games
When it doubt, go back to the basics. Play 3 vs. 3 or 5 vs. 5 without a goalkeeper and using cones for the goals, not unlike what the youngest teams do at the intramural level. Due to the size of the teams, you probably will need to have two or three games going on at the same time. But small-sided games keep every player active and doing what he or she enjoys the most about the beautiful game -- kicking and touching the ball and scoring goals.
Monkey in the middle
Another basic, but a quite effective way of keeping the team active. A minimum of four players is needed. The players in the circle must keep the ball away from the one in the middle. Players will have an opportunity to develop passing and handling skills in close quarters. Meanwhile, the player in the middle is developing his or her defensive skills and ability to read where a foe's pass might be heading.
Soccer Baseball
Hands are not allowed in this game, which helps to develop power and accuracy. A minimum of five players on a team is needed with an area that is big enough for a small baseball diamond. The pitcher kicks the ball to the batter, who swings with his or her foot at the ball. Fielders must get the ball to the base before the batter or runner is retired. There are variations you can play. One has the batter running around the bases after she or he kicked the ball. The fielders would have to pass the ball around the infield. If the runner manages to beat the relay, his or her team would earn a run. If the team on the field gets the ball home before the player, she or he is retired.
Hot Potato
This game is soccer versions of musical chairs. You need at least five players to form a circle. The object is to get rid of the ball as quickly as possible before a whistle sounds. The player with the ball is eliminated. This goes on until you have a winner. The purpose of this game is to force a player to think on his or her feet quickly as they get rid of the ball as soon and as accurately as possible.
Juggling Contests
A player tries to juggle the ball with a foot, chest or head for as long as possible. The beauty of this game or drill is that a player can do this alone or with his or her team. Of course, juggling doesn't necessarily mean a player will improve tremendously over night, but he or she can develop skills when the team is not around.