Umm, no. But i know Firestix. I used to use his minecraft account before i got my own, so everything you saw on the old server labeled Firestix was me, and now everything labeled NJigglypuff is me. It's a bit complicated.
so it didnt work?
I did the same thing I told you to do and it works like a charm
Do you have any mods installed?
If you do, backup your .minecraft, then start a new one by Force Updating
Then put in the terrain.png (it MUST be called terrain.png)
Ok, I will make a step by step instruction, with screenies all the way. I tried it myself and it works
Step 1: Go to your minecraft.jar (You know how to do this I assume)
Step 2: Open up minecraft.jar USING WINRAR
Step 3: Scroll all the way down to your terrain.png, no need to go to folders, just scroll down past the class files
Step 4: DELETE the terrain.png
Step 5: Put in the new terrain.png
NOTE THE FILE YOU PUT IN MUST, be called terrain.png