On Forumhome and many other areas where data is displayed in vBulletin, columns are displayed in alternate background colors (controlled by .alt1 and .alt2 classes). Some users & webmasters prefer to have alternating background in table rows instead. Achieving this effect on ForumHome requires just one template edit.
We'll utilize a native vBulletin function exec_switch_bg() to alternate the classes. You can read more about this function in the online vBulletin API.
Alternating Row Colors on vBulletin ForumHome:

1. Go to: AdminCP » Styles & Templates » Style Manager
2. Click on the Expand Templates [« »] button for the skin which you want to edit; and then expand the Forum Home Templates group.
forumhome_forumbit_level2_post
3. Double click on the forumhome_forumbit_level2_post list item to edit that template.
4. ADD the code shown in the first line, and EDIT all instances of alt1 and alt2 to $GLOBALS[bgclass] as highlighted below:
<if condition="exec_switch_bg()"></if> <tr align="center"> <td class="$GLOBALS[bgclass]"><img src="$stylevar[imgdir_statusicon]/$forum[imageprefix]forum_$forum[statusicon].gif" alt="" border="0" id="forum_statusicon_$forum[forumid]" /></td> <td class="$GLOBALS[bgclass]" align="$stylevar[left]" id="f$forum[forumid]"> <div> <a href="forumdisplay.php?$session[sessionurl]f=$forum[forumid]"><strong>$forum[title]</strong></a> <if condition="$show['browsers']"><span class="smallfont">(<phrase 1="$forum[browsers]">$vbphrase[x_viewing]</phrase>)</span></if> </div> <if condition="$show['forumdescription']"><div class="smallfont">$forum[description]</div></if> <if condition="$show['forumsubscription']"><div class="smallfont"><strong><a href="subscription.php?$session[sessionurl]do=removesubscription&f=$forum[forumid]" rel="nofollow">$vbphrase[unsubscribe_from_this_forum]</a></strong></div></if> <if condition="$show['subforums']"><div class="smallfont" style="margin-top:$stylevar[cellpadding]px"><strong>$vbphrase[subforums]</strong>: $forum[subforums]</div></if> </td> <td class="$GLOBALS[bgclass]">$forum[lastpostinfo]</td> <td class="$GLOBALS[bgclass]">$forum[threadcount]</td> <td class="$GLOBALS[bgclass]">$forum[replycount]</td> <if condition="$vboptions['showmoderatorcolumn']"> <td class="$GLOBALS[bgclass]"><div class="smallfont">$forum[moderators] </div></td> </if> </tr> $childforumbits
5. Hit the [Save] button. We're done!
Thank you very much, it is excellent.
@Mario: Not a problem.
Thank you for this, I’m only reasonably new to the vbulletin world and every little bit helps.