[Floris]

Goto the Forum Home Page Templates set and edit the forumhome_forumbit_level1_nopost template,
at the bottom of it, add a new <tr> table row with a new <td> table cell, let it column span to 6. <td colspan=6> and then set a hight to it, close the tags.
In between the tags, you add an <img> image which is actually transparant and set it the same hight.
Now set the color to the td tag to the one you want, (or a background image) and save the template, you are done.

<tr><td colspan="6" bgcolor="#000000" height="3"><img src="images/spacer.gif" height="3"></td></tr>

Maybe there is another way, but i only have 15 mins time now, so had to do it the dirty way. I don't understand why this takes you guys more then an hour to figure out.