I was browsing the Camaro5 forum and stumbled into a thread discussing dye for the various stitchings in the car. They were talking about using an acrylic at first but it they started using a fabric dye pen. It seems to work pretty well and no one has mentioned any fading.
(Camaro5 links at bottom of post)
Obviously you don't want to use this on fabric seats but it could definitely be used on the seats of the touring model and the console/shifter/cubby hole of all models.
From the370z.com
Dembflyr's blue dyed stitching on leather seats:
Link to full post :
Stitch dye? Anyone brave enough to try?
Falcor's Red dyed stitching on cloth seats:
Link to full post :
Stitch dye? Anyone brave enough to try?
From Camaro5.com
Dye stitching in interior - 2011 Camaro Z28 Camaro Forum / Camaro Z28 SS Forums - Camaro5.com
Uchida DecoFabric Paint Marker Carded Orange Product Detail -- CreateForLess
A nice before and after post:
2011 Camaro Z28 Camaro Forum / Camaro Z28 SS Forums - Camaro5.com - View Single Post - Dye stitching in interior
Large pictures in spoiler: