I had a black lamp that got chipped when we moved it. I just colored the chip in with a black Magic Marker. I did the same thing with my coffee table using a brown marker. On my colored wall, I patched a hole with toothpaste and baking soda, then color matched it with magic marker. Same thing with my black leather sofa. It had a small scuff in the side and a marker covered the scuff.
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Try using Sharpies instead of markers, they don't rub off or smudge like markers do. (I have tried markers on plastic for another craft project). Sharpies have a lot of colors.
