32 Light Bluish Gray
This is one of the rarest Modulex colors. It's part of the third (brightest) set of colors, which are (almost) exclusively M-logo.
I'm not sure about the 2x2 brick here anymore. I think it might be yellowed; it's still bluer than any of my Light Gray bricks. It seems close enough to the 1x1 tile (which is also in used condition). The 2x4 brick and tile are brand new/unfaded.