If the Internet has a color then it is a filmy transparency like this. This is the color of looking through a window that looks out through another window. You can see that in condos in Brooklyn, sometimes, the way one glass curtain wall opens onto another, piercing a hole in the building and exposing the blue or gray of the sky behind it, only successively filtered. I think this is how the recursive windows of the Internet work, too. They crowd the open sky of the screen, filtering and framing it into some kind of legible unit.
This is the color of polygonal clipping, when you reach the edge of a video game, like the one I played on AOL Kids Only. I remember, too, downloading packages of sprites from an MMORPG I was obsessed with and then trimming the white space around them, creating transparent layers in Photoshop and then collaging the sprites together into my own static fantasy of the game that existed entirely offline, except when I posted the resulting images to fan forums.
The thing about a window, Web or glass, is that it is necessarily limiting. Its transparency has a boundary that you will never see around.