This mod is called Gulliver. Itís named for the book Gulliverís Travels, though much of the inspiration comes from The Borrowers, Alice in Wonderland, and other size-related stories.

What it does

From the outside, it looks just like plain vanilla Minecraft. There are no new blocks or items, just two Potions.
But with Gulliver installed, you now have the ability to change your own size or the sizes of mobs & NPCs!
The world works differently when you and mobs change size. See what happens!

Download: Gulliver Mod for Minecraft 1.5.2
You can also see all awesome Minecraft 1.5.2 Mods here: Minecraft 1.5.2 Mods
You can also see all awesome Minecraft Mods here: Minecraft Mods