Feeling inspired after reading Arcade Game Typography: The Art of Pixel Type by Toshi Omagari, I set out to make my own 8x8 pixel font. I worked with a similar approach to the one I used in the larger grid font offstruct rgb.

First started in Adobe Illustrator, each character consists of three iterations of the same 6x6 pixel letter: in RGB Red, Green and Blue. These were layered, offset by one pixel diagonally, filling the 8x8 box. To achieve additive blending, I applied the "Lighten" transparancy setting. Combinations of overlaying these three primary RGB colours result in the secondary RGB coloured pixels Yellow, Cyan and Magenta. In the additive mixing of coloured lights, the equal blending of all three primary colours results in White. All pixels were then entered manually into the fontstructor and black pixels were added for display purposes.

Thanks @Cookielord and @Goatmeal!

A toned down version that is a bit easier on the eyes.