Workroom, studio, study or just plain old spare room.
I think it takes time to carve out a space that you're able to work in at home. Much of my work still spreads out to other parts of the house but it is so nice to have a spot where just my particular chaos can reign. I'm sure everyone else appreciates it not completely taking over our home too.
I love seeing other home workspaces. Factor in general household goings on and it amazes me what can be put together on a kitchen table.
By the way, these photos are close ups mainly due to the current state of disarray in my workroom but I promise some other views in the future. On a positive note - it does mean I've been busy!