I want my scrappy quilts to look spontaneous, but they are very much planned. I do not just grab one piece and sew it to another, so I need a big work area to lay out the pieces and look at them.

I don't have a big design wall on which to plan my quilts, and I think working on the wall would be a bit rough - I'm only five feet tall, and pinning something to a wall means getting up and down off a step stool, and that's just a lot of work. Besides, I want to be able to look at it from a distance.

So I design my scrappy quilts on the floor. Since I hate measuring (and if I measure, I usually forget the measurement in about five minutes) I just make an outline of the top of the desired bed size on the floor using blue low-tack painter's tape.

My apartment is in an old building, and it has a "vintage, mid-century" linoleum floor. It's nice and smooth, and it's rather tough. So the tape goes on, and comes off, easily. This outline (top picture above) is for a twin bed, with the extra bit at the bottom the dimension for a "long twin."

As you can see, it's rather useful.
Here my sister and I did the same thing when we assembled the
quilt for Cassie.

And I don't just use it on the floor. Here it is stuck to my design table marked off to help me make 20" blocks.

To make the outline on the floor, I have a 48" long metal ruler, and a large 45-45-90 triangle I use to make the shape a proper rectangle with 90-degree corners,and low tack painter's tape. I just happen to have it 2" wide, but you can use any size you have.

I've left it down as long as two months, but I pull the tape up after each quilt.
The only disadvantage is that my cat loves to play "Slip and Slide."