Here is a lighter color for the Canvas.
Under nodeeditor/core/imgs, save the original grid.png, and replace it with the lighter grid.png.

The colors of the original grid was inverted. This was done with Gimp2, or with Greenfish Icon Editor Pro (GFIE).
The lighter colors were swapped with GFIE. GFIE does not compress the PNG, so PNGGauntlet was used to shrink the PNG file size.

A button to select the grid colors might be nice, as well as an even lighter grid for printing.

- Brian (Grid.png removed as it is no longer used.)