I got this idea from the WoW lock forums to make rain of fire look like death and decay.
The sound and graphic have been changed so it is a complete change, rather than have the ground bubble yet it still sounds like fireballs are hitting the ground.
RoF_to_DaD.mpq - FileFront.com
Edit: Image upload
Reichman88 Gallery, Reichman88 Image Gallery - FileFront.com
Enjoy!