How do I add storage to my craft room?

Tall book cases. They hug the wall and go up instead of taking up floor space. You can always put see through storage boxes on top of them.

Any pictures? What type of crafts?

Hi, Clear Plastic Storage Boxes - on rollers that will stack,and label them..............

I reused a bathroom vanity and an old bookcase.

We have a small bedroom with a double window in the center of one wall, and about 32" on either side of it. In front of the window, I centered a skirted craft/sewing table, made from a table top resting on two old filing cabinets (which you can't see, as it is hidden by the skirt -- my back is to the window as I sit at the table). On one side of the window, I placed an inexpensive white bookcase where I keep sewing supplies, fabrics in baskets, a paper cutter, etc. On the other side of the window, I hung a piece of white plastic pegboard. On this I attached little cans of craft supplies such as markers and pens; spindles of wrapping paper and ribbon; scissors; a basket of craft paints; and my sewing thread holder. Anything else I need is hidden in the closet!