If you decide to paint the glass window frame, the walls, or rods make sure that you stay with off-white or light colors. Avoid using dark tones if you want to create a calming effect. In some sunrooms, a unique color scheme to use would be black and white but you have to make sure that you keep the black to a minimum or else it could start to look too dark and not be a calming place. You could also decide to do a white and brown scheme and have the furniture in different shades of brown.
When choosing blinds and curtains for sunrooms a great idea would be to use vertical blinds for the windows. There is also bamboo or matchstick roll up blinds. Curtains should match the rest of your furnishings like the rugs and couch cushion covers. The curtains that work best for this room would be floor to ceiling curtains. You can open them and hold them open with rope tiebacks. Choose light shades because over time the darker shades fade because of exposure to the sunlight. You can also get curtains that have linings to help prevent fading.
Many sunrooms that you see in magazines use many plants for decorating because they are a convenient and simple option. Plants will help to keep the room cool along with creating your desired atmosphere. You can hang baskets with ferns or other plants in the corners of the sunroom. If you have corner tables small plants or flowers would look good there. Sunrooms can become very hot during the summer so make sure that you choose plants that thrive in the heat. If you do not want to mess with real plants you could get artificial plants.
Furniture should be comfortable to sit on and should fit your overall color scheme. You can choose wicker furniture, beanbags, large throw pillows, etc. Just do not crowd the room with bulky furniture. In most sunrooms, they use small corner and side tables.