Simply put, I found it absolutely required to fix the horrible lava texture that was currently in the game. Before this fix, the lava made my eyes sore from just looking at it. Something had to be done and this fix should hopefully do it.

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Installation:

Get DSfix http://darksouls.nexusmods.com/mods/19
Set the texture overide setting to 1.
Save the pngs to Dark Souls folder\DATA\dsfix\tex_override
Play the game and enjoy not getting your eyes blasted from neon bright textures.
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Now then, I have added the high resolution textures! Problem though is there may or may not be loading issues, mainly due to the texture file size being extremely large size
(24MBs total for the 3 textures, each texture being a whopping 3000x3000 resoultion!).

But, due to my awesomeness, I have already uploaded a smaller file version for you!
So bathe in the goodness that is lava textures done right in dark souls.

Have fun, and keep an eye on this mod later for new and exciting versions!