LOL - I call mine a sewing room or studio depending on my mood and what I am doing. It's also where I keep my computer, my loom, many books, and other things. It has good lighting (with two big windows and a little balcony outside and it opens with double doors into our bedroom) and one wall is a "design wall" - like a bulletin board that covers most of the wall so I can plan quilts, garments, etc. as well as pin up notes and swatches and patterns. I do a lot of photo editing (for the garments and quilts I sell, mostly, and for my website), and I use my autoCAD program to draft quilt patterns.
I do use it for designing and creating as much as sewing - possibly MORE than the sewing time! But usually the words "sewing room" come out of my mouth before "studio" because "studio" sounds a little pretentious. :lol: