Once you have chosen your core colour ask for a swatch of fabric. Usually you will receive a few threads of fabric stapled to a business card. This is impossible to share with all of your vendors, so the solution is to head to your local paint store. Your paint store will have paint chips to match your color that you can take to the vendors who require a sample.
Now let's go back to school and learn about pairing up complimentary colours. You may remember the colour wheel from art class. There is definitely an equation when it comes to putting the right colours together.
Any of these combinations or shades of these combinations look great.
My favourites are monochromatic. An example of this is taking the colour red and adding black to the red to make it darker, or taking white to the red to make it lighter. You can do this to any colour.
Another colour grouping that works well is analogous. This is colours that run side by side on the colour wheel like; blue, blue-green, green or yellow, yellow-orange, orange.