BisonTech

This plugin replace WP default admin/login/register page. 
The technique used is pretty brutal but the best currently possible, the plugin replaces the modified files automatically. 
To make the plugin run the web server must be able to write to the wp-admin directory. 
more info @ http://www.bisontech.net

LogoReplacer

This plugin replace WP default admin/login/register page.

Clker.com plugin allows you to search for clip art images while you are writing your posts. It communicates with clker.com, runs the search and displays the clipart results for you.
Every clip art image comes in three sizes. If you click on any of the search results the picture will be inserted into your rich text editor TinyMCE.
The plugin is so easy to use and there is no work for you to do and no uploading images.
Change log 
Ver 1.1 
1. Added a disclaimer 
Ver 1.2 
1. Fixed a bug with the tags of the search.php script. Used not to work on some FreeBSD installations. 
Ver 1.2.1 
1. Moved the disclaimer to the bottom of the screen 
2. Added a link to the bugs/features page 
3. Added a link to rate the plugin at wordpress.org 
Ver 1.2.2 
1. Fix a bug related to showing stock & raster photos. 
 Ver 1.2.3 
1. Fix a bug with SVN committing version 1.2.2

Clker.com clip art

Search and add Clker.com clip art images to your posts.

LogoReplacer vs Clker.com clip art