I use the kitchen floor tiles to square up my quilts since they're one foot square. I make the layer sandwich on the kitchen floor and slide the cutting mat under it, kind of matching one edge of the mat to a line on the floor... very handy. I sometimes tape the backing to the floor to keep it flat while placing the batting. Also do my safety pinning and basting while it's on the floor.
I keep most of my quilting supplies in a laundry basket and schlepp it off to the church quilting ministry every week. That way I can toss in some fabric or a WIP or 2, camera, magazines, and so on.