I enjoy my work and if I did not, Jelsoft would'nt have hired me
You can write it yourself, in some other application and copy it into the additional css box.
Basicly, before in the long long ago of vB2, styles and template mods were a pain, because either all templates could share 1 single set, or all be unquie. Now in vB3 we have a parent child system However, this has always been the case to some degree as it was in vB2, just most people never knew, and you really couldnt take advantage of it.
We have the following template setup in vB3
*Master Hidden Style*
-Default Style
Now, everything that would be done to the master style if you were to edit it (but by default you cannot, and you really shouldnt) it would get inherited into the default style, unless that template or bit of css or style var, etc.. were already customized in the child style
So If you want to have a bunch of styles use the same template set but only differ in colors and images
Default Style
- Blue Style
- Orange Style
- Red Style
-- Red and Black Style
So like i said up there, any changes made to the default style, get inherited by all childeren, unless they have that aspect already customized.

Lets take this abit further, lets say you make a few changes to the Red Style, it will have the changes and so will the Red and Black style, if you were to then make one more change to the Red and Black style, only the red and black style gets it.