The Stalker Creeper mod for 1.6.4/1.7.4 is a simple mod that changes the behavior of creepers. In the changelogs of Minecraft, it says that creepers are supposed to stalk the player. This mod makes this happen by having creepers follow the player, not exploding until the player looks at them.
Download Stalker Creeper Mod for 1.6.4/1.7.2:
StalkerCreeper Mod for 1.6.4
StalkerCreeper Mod for 1.7.2
Forge Installer for 1.6.4
Forge Installer for 1.7.2
1) Install forge using the Forge Installer.
2) Drag the Stalker Creeper .jar file into the .minecraft/mods folder.
3) Launch Minecraft
4) Before you push play, click on Edit Profile