I love designing imaginary rooms/houses almost as much as quilts! If I could build my own separate studio, it would be quite large and modern to fit my tastes...... and allow me to almost live there! I would design it to be as energy efficient as possible, with solar roof, integrated concrete form exterior walls, standing seam metal roof, and cool polished concrete. floors. For my climate, I would want my long wall of windows to face north and the southern exposure to have clerestory windows shaded by deep eaves. I would leave the wood trusses exposed. DH and I have come to dislike the large numbers of recessed lights in our house with 12 ft. ceilings, so I would have suspended fixtures and pendants, with hidden strips of LED up-lights and sconces around the perimeter.
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All of my sewing furniture and cabinets would be finished on four sides and have locking casters for mobility. I would use lots of drawers with easy-close glides and fabulous hardware. Counter and table heights would all be 36" for standing or sitting in a drafting chair.
I would use soft-white paint, light woods, natural linen, cream leather to keep the space light and airy. Punches of color would come from exposed quilting and clothing fabric stashes, neatly organized on shelving with glass doors, and from a design wall and quilts on display.
I need to win the lottery to pay for this!