The size of images (and final products) you can create is dictated by the size of your printer and heat press, which can be a limiting factor in regard to larger items such as a throw blanket or shower curtains. However, there are companies like Picthegift that offer wholesale accounts that are happy to print and press oversized sublimated items for you. Outsourcing to companies that offer larger items, such as bathroom or kitchen mats, blankets, and other personalized substrates, can give you a boost in sales. The only work needed for you to do would be to supply the design.
-Cheryl Kuchek, Just My Imagination DeZigns