Amazon Associate Examples
These are example of a new type of link that Amazon provide. They are Self-Optimising link. Currently this is still in the beta stage and as a result the products displayed may not actually suit your content.
A bad example of an Amazon link. It uses the default settings and stands out a mile off, therefore it automatically puts people off. It doesn't tie in with the theme of the site and therefore people will generally just skip over it.
Below is a type of link that maximises its potential. The link colours tie in with the site, and it appears seemless since the border has been removed. You can also choose to substitute the Amazon image. This will help your site look less crowded and more focused.
Placement is also a key issue aswell as the actual products you choose to sell. You need to think about where abouts the visitor will be looking and what they want to see. If the placement seems too obtrusive it will not be effective. Try and be subtle with your product placement.