Hi all,
i found a nice application, which actually is made with a CNC-dispenser, but would be an interesting sidepath for RepRap: [
www.skyglass.ru]
Here a dispenser draws the outlines of decorative images with an elevated tray of coloured paste (mostly black) and pours/sprays "windows-colour" in the surrounded areas.
Imagine the same with ABS-filament and maybe three or more slices high, so you can make thicker or even 3D-images ...
Viktor
attached some examples: