Depending on where it is... could you seal the hole and mount something there ( a light, a speaker, even a simple hook to hang stuff on), and pretend it was there by design?
Or fill it, smooth the surface and put an opaque decal over the patch?.
If all else fails, some very careful paint matching might be your best option.
IanP, the man from Scotland
Julie, the Lady From Little Rock
Jay Feather 19XUD, pushing a Jeep Grand Cherokee