You can affix L brackets into the studs and then put shelving board on the brackets.
Put cleats on the sides then cut board to fit the area.
Any home improvement center has a plethora of brackets and pre cut shelving boards to choose from. You can paint or stain to achieve the dresired effect.
Sue....You can purchase vinyl shelving from Lowe's along with attachments for wall. It will probably cost more but would be easier for me if I were doing.