This is one of the toys I found recently.  I took it apart and used spray primer to paint all the plastic parts black.  The metal pieces got a quick dry brush of Boltgun Metal, and I touched up the tires in black.  I left the paint job on the metal body alone except for painting over the glowing power supply effect in the roof.  I gave it a wash with a dark rust color, then weathered it using a mud color followed by a dry bush of sand color.

It’s a little cartoon like, but it looks playable and I did not have to do any conversion work at all.