Omega makes an outstanding massage chair for offices.
You can add a pillow of any sort on the seat of your chair for extra cushioning. This probably will add a little more comfort or you can simply buy a new office chair if you're unsatisfied with your office chair.
You can find office chair replacement wheels at office supply stores, furniture stores, or online retailers like Amazon or Wayfair. Make sure to check the size and compatibility with your chair before purchasing.
The key to a comfortable office chair is to find a chair that fits the customers body size and to find a chair that is adjustable. The companies Alera and Basyx both make adjustable office chairs.
Before buying an office chair, make sure that it will look nice in your room. It would be terrible if the chair clashed with the aesthetic beauty of the room you would put it in.
The simple contoured design of many Eames office chair options make them perfect for a change from a traditional chair that is causing you back problems. A good Eames chair will last for many years.
No massaging will not make them bigger.
Office chair mats are not an absolute necessity, but they do serve multiple functions and can be very handy to have. They help protect the surface your chair will sit on (whether it be wood, linoleum, carpet, etc) as well as make movement easier. To read more on the benefits of chair mats, please visit: http://www.sitbetter.com/blog/chair-mats/the-benefits-of-owning-a-chair-mat
Executive chairs are a popular way to make an office space more comfortable, but they work best next to a traditional executive office desk. Consider an executive desk and chair together for a professional look.
While looking around for a home office chair, be sure to sit down in them. This will make sure that you don't buy something that isn't actually comfortable for you, which could possibly cause problems.
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If you're using an inferior chair with your home office, consider switching to a dedicated computer chair to make sure you're posture is good and comfort is maintained. A bad chair causes long term damage.
office star offers custom office chairs for people who are taller and they can make them per order so you can add the features that you are looking for in your special office chair.