Side tattoos for women are increasingly popular as the design ideas are limitless. You can do a design only on your side, start at a hip and go toward the chest or conect a back and side tatto with the same or similiar design elements.
Be aware that the ribs are one of the more painful areas to place large tattoos since there is less muscle and more bone/skin in this area instead of on a more muscular area such as shoulders.
You can use color or black and grey inks and have some really spectacular results. Whether you use text, florals, symbols or anything else you chose, you should have fun with it and get something you really like.
As always, work closely with your tattoo artist to get the best results for you and a design you will love.