Light colors reflect light whereas dark colors absorb light. To make your rooms look larger choose a light color. Also, having sufficient lighting will make it a happy place.
Lastly, if you really organize you sewing stuff (fabrics and notions), your space will feel spacious. Use what you have like bookcases for your fabric. Here is a link on how to fold your fabric for stacking using your ruler.
http://www.youtube.com/watch?v=rkTlaMqRlwo
Have fun setting up your space, and take pictures so we can see, okay?