Show the product in projects you make and give plenty of suggestions of what to do with it. Be creative. Obviously, this not only helps your followers buy but keeps them coming back to you and inviting their friends to follow your blog as well.
For example Lettering Delights sells Spectacular Specs. The most obvious use is to cut them out and where on your face for a fun photo shoot.
But when you have another idea or use, let your followers know. Give them solutions and they will love you for it.