Spa Massage Therapy Postcard templates. Select from one of our professionally designed spa postcards and customize it to fit your needs. Use our online design tool create a unique design for your company. A postcard design can play a vital role in the marketing of your massage and spa business. We have created each postcard with the right words and images that will be effective in promoting your business. These postcards are great for spas, massage therapy, physical therapy, etc.