I made it out to a LEGO store this weekend and got the parts I needed for this guy:
This is the logo for the place where I work. This was done using a 48x48 baseplate covered in black 4x8 plates. I then use an image reduced to 48x48 pixels. For each point on the image I guestimate a lightness value between 1 and 5 with 5 being full white. I then layer clear pieces until I get the color I'm looking for. It ends up being a big paint-by-number.
Sorry no instructions for this one. I think they would be pretty difficult to read anyway.