Is there a tool out there that would help you visualize what your marker would look like when anno'ed? I would think it would be fairly simple, have the silhouettes of different popular marker parts and a color wheel/pallet that would allow you to approximate your desired color for each part and apply different effects you might want. I was thinking about mocking up my envisioned color scheme with Paint or maybe even just drawing it, I figured I would ask before I battle with Paint or challenge my limited artistic ability.