If you are not quick feet without the ball, then you are not quick feet with the ball... It's logic that you can improve tight control like C.Ronaldo by running with the ball, but to imrpove over all quickness;
Run hills down and up.
Set your own routine for how much you feel to train and how many sets you wanna do.
Run up a hill down and up 3 times, 4 sets... Have a break after each 3rd time.
Just an example. Because how many sets you do depends on yourself. I would reccomend to not take a too long break or else your muscles will build/work slower and you will not improve faster. It's up to you, you can make it into a condition training at the same time...
I can assure you that being quick feet isn't just about muscles so I would also suggest the ladder drill which is almost like a stretch out/warm up but helps you get quicker feet;
LINKS; http://www.sport-fitness-advisor.com/la ... rills.html
http://www.sportplan.net/drills/Athleti ... F88D56271F
If you don't have a ladder then just draw one with bricks or something... as long as you move your feet in a co-ordination it will help... Doesn't have to be hard training.
I also would add the drill where you take a cone and do stepovers for 20 min around it.. Use anything if you don't have a cone as long as what you use is sized with a cone or a 4 size+ ball.
These drills don't just help for quick feet but also, acceleration and full speed.
If you wonder something, ask here, or just google it... Remember google is your friend.. Be creative with your search and you will find something useful
There are allot of other exercises you can do with the ladder drill, I didn't post all of them... Might post it later, or like I said, you can google it:P
Good luck on improving!