Material for character silhouette I wanna make a animation made out of silhouettes (as a solid shape of a single color) like 



this,

or 



this 

or even like



this. 

Some people say to not put any material at all, but then that would be a problem if I want to have colored character.

What am I supposed to do?
If you are using Blender render then check the Shadeless option in the Material tab:-



And if you are in Cycles then use this node setup to create a Shadeless material:-