"Furniture Board is suitable for a wide range of applications, including shelving, bookcases, wardrobes, cabinets, occasional tables, bespoke furniture and kitchen units." (So say B&Q's website....what a load of old cobblers)
Is it 15 or 18mm and what colour? I have once used the white regular stuff as shelving for a built in but in truth I hated it. All I wanted was a wipeable melamine surface in white. Can you get it in 18mm from the sheds?? Can you b......cks! So I was stuck with 15mm which caused me to have to build a sub frame to support the weight under the shelves because it is very whippy. (over 2m it is anyway). Its outrageously expensive and the edge banding looks cheap and hideous. Personally I would rather be hung, drawn and quartered than ever actually display it to the naked eye as B&Q recommend above. Occasional table....my backside....occasional bonfire, now that's something they could put in their marketing!
To get the decent stuff you would need to find a professional MFC supplier.
Any scraps are good for garage use. Because they're wipe-able and slick I used the off cuts up for jigs where the surface needs to slide and 2 small shelves for a garage cupboard. But to be honest, every time I see where the melamine meets at the corners I always want to rip it out and set fire to it. Reminds of cheap Formica stuff from the 70's. A style I always instinctively hated.