This was done in GIMP with a photo I took
lol, I wondered... I thought it was either 3D, or real (it wouldn't surprise me if someone somewhere had a gold-plated car). Imagine seeing one of these on the road as you go to the post office or something, lolWhat exactly did you use to change the colour? I usually turn to either Colourize or HueSaturation, or both :)
I use the Colorize; it's worked pretty well in the past.