You will need Mozilla Firefox and Adblock Plusfor this tutorial.
You will also have to install Adblock Plus for the version of Firefox you are using.
Go to Add-ons

Select: Browse All Add-ons

Search for "Adblock Plus"

Add Adblock Plus to Firefox.

Once Adblock is installed to Firefox, lets begin.
Go to the RemnantMods' Theme files.
http://forums.remnantmods.com/styles/su ... eme/images
Select Background_Tile.GIF.
Copy the URL. (Ctrl + C)
- I didn't copy the correct URL for some reason. Use this

Now lets add a subscription to Adblock Plus.
Click on the Drop-Down part of the ADP button. Select Preferences. (Ctrl + Shift + E)

Go to Filters > Add Filter.

Paste the Background image's URL. (Ctrl + P)

Press Apply then OK.
Your Done! Just go to the forums' index and if you don't see any results, press Ctrl + F5.
Before:

After:

Enjoy!