Minecraft: How to change block textures?

Not with a texture pack. I can't figure it out. I opened up the jar file with winrar and found the gravel file under the textures. It was a single side of the gravel since all sides are the same. I edited it successfully so in place of the small 16x16 gravel texture was the small 16x16 new texture i wanted in its place. I then hit save, it said "this file was changed, do you want to save it" something like that, i hit yes, it did it successfully, and when i tested the file by opening it, it was the texture i wanted. There was no other png file named gravel. But when i opened minecraft the gravel was still the same. Did i do something wrong or open the wrong texture file?

Guest

1.
Right click on "minecraft.jar" and select "Open With > Archive Utility." This will decompress the.jar file and create a folder called "minecraft" within the "bin" folder.

2.
Open the new minecraft folder and locate "terrain.png." This file controls the look of the different blocks in the game.

3.
Open "terrain.png" in your image editor of choice and make changes to whichever blocks you desire.

4.
Save your changes and close the image editor.

5.
Right click on the minecraft folder containing "terrain.png" and select the option "Compress 'minecraft'." This will create a file in the /bin directory called "Minecraft.zip"

6. Rename "Minecraft.zip" to minecraft.jar. Your changes to the block designs should appear the next time you load the game.

Jenny