I have found these to get a great option
they are super strong and very easy to assemble
I just installed a smaller unit for our pantry closet
Attach 2x6's to the block. horizonally and/or vertically From there the possibities are endless.
What are you trying to store - for shelves I agree with KMS & would definetly stay away from the cheapparticle board versions
For other items you can always look at mounting items with concrete anchors (though I would lean more towards using epoxy based anchors)
If it is shelving you are looking for. Steel shelves may not be the prettiest but they are simply to put together and fairly light on the wallet.