Click for a demonstration:  
 
* Commodore  
* Splat  
* CLI  
* CLI2  
* Conventional  
 
All of these themes except "Conventional" which is a hack of Classic can be found on themes.wordpress.net.  
 
 
Posted mostly due to the incredible c64 theme. You even type in your commands!
The Commodore 64 one is sweet
SpearmintFur: Though it won't let me do BASIC, ha ha.  
 
You are so getting a 10.