[LaCN]

For peeps, who don't want the prefixes to be set by members, but only by moderators:
revert or not edit the template newthread, so u won't find the dropdownlist there

For those who only want images as prefixes, go to:
vBulletin Options / Help Thread Prefixes v1.6.1
And edit the Prefix HTML Markup (within forums) to:
<img src="images/prefixes/{1}.gif" title="" />

Unfortunately I tried to use {1} two times (as title="{1}") with no luck

But with images as prefixes, u can make ur prefix any color u want.
(type a word in a image-program, give it a color, save it as gif, and u're done
or just make a cute pic for it