Here are a few photos of my workspace! I wish I had a formal sewing area, but for now, the sewing machine sits on our dining table. There's not much room in a Manhattan apartment to put it elsewhere! I place the sewing machine in a closet when guests come over.
I do most of my cutting on the floor in front of the TV (today I was watching old episodes of HBO's "Rome"), and I slip the cutting mat, rulers and blocks-in-progress under the TV unit after I finish sewing.
As for a design wall, I tend to use the living room floor and just take photos of my work as I go along to see the big picture. It works surprisingly well, although my ever-patient husband has to jump over quilt blocks on a regular basis. :)
One day, I hope to have a real sewing room...a girl can dream!