Can anyone tell me if I can display " blocks" with the library ?
Character 255 is a block. If you need finer resolution than one character cell, you need to define your own characters. I believe there is functionality in LiquidCrystal to do this.
i have been messing around a bit with Nokia 3310 and it's kind of good substitute for graphic display
USD40 against 5$ and decent amount of pixels (84x48), not as much as KS108 based but still not bad.