Bacon, Blue 1, Blue 2, Blue 3, Blue 4, Coffee, Dark Tan,
Green 1, Green 2, Green 3 - Jolly Green, Green 4 - Martini Olive, Green 5 - Cats Eye, Green 6 - Mint,
Latte, Orange 1, Orange 2, Orangey Yellow, Pink 1, Pink 2, Pink 3, Pink 4, Pinky Peach,
Purple 1, Purple 2, Purpley Blue, Red 1, Red 2 - Red and Bleach, Roast Coffee, Salmon, Watermelon Pulp, White, Yellow 1, Yellow 2

1) Go to Admin > Themes > Layout templates > Home. Line 54 you will see the below. Edit the bits in purple to whatever groups you have on your forum.

<tr style="border-top: 1px solid #232323;"><td style="text-align: left !important; padding: 0px 16px; padding-top: 8px;"><font color="#309cda"><b>Big Cheese</b></font>   <font color="#f418f7"><b>Global Mod</b></font>   <font color="#ae52be"><b>Elite Spam Eater</b></font>   <font color="#9cd411"><b>Spam Eater</b></font></td> <td style="text-align: right !important; padding: 0px 8px; padding-top: 8px;"><font color="#ff8400">Art Appreciator</font>   <font color="#afad61">Groups Fan</font>   <font color="#e2417c">I Like A Challenge</font>   <font color="#444444">Lord of the BANNED</font></td></tr>

2) Admin > Themes > Colors and Styles > Style Sheet. On the last line, line 1606 you should see  an URL. Replace the current imgur.com url with your own. The image for this is called "vertical-side(gears-icon).png".
I recommend uploading to your own host, just in case it gets deleted or any other reason.

3) Admin > Themes > Colors & Styles > Style Sheet, add the below to the very bottom:

.ui-selectlist .ui-selectlist-item.state-current {
background-color: #262626;
}

(thanks to @peter3)

Category Splitter by @smashmaster3 (set the margin to 0px if you want no split/gap)
Number of Member Likes by @shortyverrett94
Color Palettes by @todge
Yootil Library by @peter3
Theme Changer by @petermaggio

Post Splitter, by @cddude
Thread Views, by @peter3
Add 'Reply' Button to Action Bar, by @smashmaster3 (I think it was you Brian, apologies if it was someone else)