In general graphics LCD displays are not well suited to the arduino. There are some exceptions where people have supported the software to drive these. The most popular one is the nokia 7110, google it.
Yeah.. you can use some LCD's.. and maybe all, but some are definitely not worth the hassle.
But with the graphic LCD's most people sell, have the LCD driver built in (a chip that connects all those 48million pins from the LCD, into something with less pins) for example, this LCD from Gravitech uses SPI to communicate, so it only needs 4 connections (not including ground/backlights/power)
Where as these, also have a built in controller, use about 7? (I'm too tired to count the pins) not including power and whatnot.
And there are others that use Serial, which only require 1 wire.. and I2C which I believe is 2. But it all depends on what driver the LCD has.
Is there an easy way to track down details on color LCDs hacked out of things like old digital cameras? (I have a couple sony cybershots that could contribute to the cause.)