How To Build a Fireplace

Im making my tiny house into a small gallery for pictures so I want to keep it all very simple - no complicated design anywhere.
The biggest room, (not large) has a very ugly old granite fireplace in the corner, it is chest high, just plain, block slabs of granite, - one accross and one down on each side. and the inside - is all granite also. (theres a log burner, free standing, in the space). On one side - the granite slab looks narrower than the other - because it is partly covered by the dry wall insulation of the adjacent wall.
Imagine an upright, very large, lopsided, stumpy freezer with no door, with a large log burner inside,
but all made of thick, very discolored, blackish/greyish/patchy/sooty/ granite slabs, that stick out of the wall about six inches, all around. (ie - it isnt flat to the wall)
It is impossible for me to remove it - it weighs a few tons. If i just paint it - that doesnt conceal the lopsided look - which I must keep also - (its impossible to remove dry walling, adjacent)
I must keep the log burner for the winter & want to discover a very simple way to make the whole thing look less hideous.
Anyone got any ideas, please? ;o))
Ive considered making it a ’statement’ - ie - a ‘work of art’ on its own - with a painted design in very bright, or powerful colors, but I would prefer it to be unobtrusive, so that it does not detract from the other art to be hung in the room…

Just get a wooded fireplace surrond and mantle from a home center. It should fit over the top of the existing fireplace and hide the granite.

It will need to be secured to the wall and caulked in. You can paint or stain them.