Have players form 4 lines each at one corner of a 30x30 or 40x40 square. The first player in each line has a ball. On the coach's signal the first player dribbles diagonally across the square to the other side. Ideally, players will meet somewhere in the middle of the square and if they don't keep their eyes up, they will run into each other. After passing the middle players continue on to the opposite corner where they give a short pass to the next player. Then all 4 of those players go. If run continually this can be a pretty good workout, because it goes pretty fast.
Variations:

1. Have players do a "move" somewhere in the middle.
2. Have players change speed as they go across square.
3. Have players use different parts of their foot or their weak foot.
4. Have each group try to "pass" the person in front of them. (This messes up the timing of the meeting in the middle, but encouragesspeedier dribbling and accurate passes.
5. Just for fun, have them try to dribble across with their eyes closed and teammates must direct them, or they can try to juggle their way across.

From: Jane Shields U-12 Girls Hamilton Heights Youth Soccer (Indiana)