Clever storage is the answer, I can reccomend Tufferman shelves although I think they are the generic knock together shelving units, when you start putting them together you think they are going to be rubbish flopping all over the place, once they are together, and then the bays bolted together, andthen fixed to the wall they are really good. Amazed at how much 4 bays can soak up.
I have just done mine over the summer, building 12' onto the 20' already there so I now have a home for the minor and the workshop / storage. I also threw lots away in the process of refitting and moving.
Some masonry paint over the wall really does throw the light round, and paint the floor if its bare concrete. Paint will also help stop a little bit of damp getting through if its single skin brick as mine is.
I also had a roof light fitted as that saves on a window which gives wall space for hanging, gives three times as much light for the same size window.
Couple of pics below....[frame]

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