Pams Mushroom Spawn Mod
Pam’s Mushroom Spawn Mod adds giant red and brown mushroom spawns across several biomes.  Change their frequency in the config file.
Block IDs: None, Item IDs: None, Config File: Yes
Installation:
- Download and install the latest version of Minecraft Forge.
- Download and place mod ZIP files in the /mod/ directory of your /Minecraft/ folder.  Done.