fullo

The Ribbon Manager plugin give the ability to add a side ribbon on the blog without touching the template file or the css. 
Please note that the plugin needs a theme with <code>wp_head();</code> and <code>wp_footer();</code> enabled.
<h3>Arbitrary section</h3>

FCC Ribbon Manager

The Ribbon Manager plugin give the ability to add a side ribbon on the blog without touching the template file or the css.

zpop

Ubuntu ribbon is made to promote Ubuntu.
A Ubuntu ribbon will be put on in the top right corner of your website, linking to the <a href="http://www.ubuntu.com/" rel="nofollow ugc">Ubuntu</a> website.
This is a fork of <a href="https://wordpress.org/plugins/stop-censorship-ribbon/" rel="ugc">Stop censorship plugin</a>.
In serbian at <a href="http://zeljko.popivoda.com/ubuntu-ribbon-wordpress-plugin" rel="nofollow ugc">Željko Popivoda</a> blog plugin page.
My other plugins:
<ul>
<li><a href="https://wordpress.org/plugins/ubuntu-sidebar/" rel="ugc">Ubuntu sidebar</a></li>
<li><a href="https://wordpress.org/plugins/ubuntu-sidebar-lite/" rel="ugc">Ubuntu sidebar lite</a></li>
<li><a href="https://wordpress.org/plugins/lubuntu-ribbon/" rel="ugc">Lubuntu ribbon</a></li>
<li><a href="https://wordpress.org/plugins/lubuntu-sidebar-lite/" rel="ugc">Lubuntu sidebar lite</a></li>
<li><a href="https://wordpress.org/plugins/debian-sidebar/" rel="ugc">Debian sidebar</a></li>
<li><a href="https://wordpress.org/plugins/debian-sidebar-lite/" rel="ugc">Debian sidebar lite</a></li>
<li><a href="https://wordpress.org/plugins/debian-ribbon/" rel="ugc">Debian ribbon</a></li>
</ul>

Ubuntu ribbon

Help Spreadubuntu by putting a ribbon on your WordPress site.

FCC Ribbon Manager vs Ubuntu ribbon