Thanks for the help whs and macropod.
To apply paragraph Styles here Is a problem too, because the list Is huge:

So, It's also a pain to search and select everytime the desired style.
I tried to show only one style (to do the job with only one click), but without success, (removing the style from the list, also make the original text without any style).

The "recent colour" tip could help me, but It just doesn't exists here (Office 2003).