Corner Ad is a WordPress plugin for minimally invasive advertising that gets displayed on top corners of your webpages. The position is typically under-utilized by developers and attracts your visitors using a cool visual effect and imitating a page flip.
Linkimage is a brand new WordPress plugin which allows you to display images by using same old media uploader or simply grab them from WordPress media library and display them on sidebar widget with custom links using various customization options. The plugin also provides you a premium version upgrade which offers shortcode and a few more useful features.
You might have seen some sites displaying 125*125 static banner ads. WordPress repository has a plugin that provides you feature to create these banner ads easily. They can be run on specified number of days, and will automatically be taken down. It track clicks too.