I've always wanted a fireplace in my home. For months I searched for a wall-mount unit, but never settled on a place to put it. So instead of adding another item to the wall, I modifed something that was already there.
I bought a $100 stainless steel firebox on the eBay. It's designed for use with gelfuel, ethanol, or isopropyl alcohol and doesn't require venting. So I embedded the firebox into my existing Ikea Lack shelf.
Lack shelf and firebox
Outline of firebox traced onto blue tape
Hole cut in shelf - no turning back
Fire is good
The flames jump up to 18" or so, making it quite dramatic. The shelf gets hot on the underside after burning for a while, so I snuff it out after 20-30 minutes. To provide a degree of fireproofing, I chipped away all the dried glue inside the shelf and lined the interior cavity with aluminum foil.