How to get a texture pack in minecraft?

A texture pack is a collection of files that is used to change the in-game textures of blocks, items, mobs and the GUI. They are zip files that have various PNG images in them and a pack.txt. The native resolution of Minecraft's textures are 16x16 (measured pixels in block height and width). 32x32, 64x64, 128x128, 256x256 and 512x512 textures are referred to as 'HD'. Any texture can be animated in Minecraft 1.5 or later. All PC versions of Minecraft support custom textures, although old versions (Alpha 1.2.2 or earlier) require the modification of the minecraft.jar file. Versions prior to 1.5 required a patch/mod, such as MCPatcher or OptiFine, for HD packs and animated textures. Texture packs can be read without being in a.zip file, which allows the use of the "texture pack reloading" key (which is F3 + T). In 1.6, texture packs were succeeded with resource packs.

To install a texture pack, download a texture pack from the site of your choice. Most texture packs are in ZIP file format, but as long as it has the necessary files (Pack.txt), Minecraft will recognize a folder as a texture pack. If you create your own textures, you can ZIP them if you feel it is necessary. For in-depth instructions on obtaining the files to make your own custom texture pack go to Tutorials/Custom Texture Packs. However this is not necessary, as of snapshot 12w23a, for as long as pack.txt exists, it will be recognized as a texture pack.
Run Minecraft. If you already have Minecraft running, make sure you save and quit the world: you need to at least be in the main menu to continue.
Click Texture Packs button. (If you do not see it, go to Options)
Click Open Texture Pack Folder button; this will open the folder where Minecraft stores all texture packs. If nothing happens, you need to find the folder manually. Depending on your operating system it is:

Windows XP/Vista/7/8: %appdata%\.minecraft\texturepacks
GNU/Linux: ~/.minecraft/texturepacks (This folder may be hidden in the Home folder)
Mac OS X: ~/Library/Application Support/minecraft/texturepacks (This folder may be hidden)

Note: Versions prior to 1.5 require a patcher, such as MCPatcher or Optifine, to display HD textures properly. Versions prior to Beta 1.8 will crash if you attempt to use an HD pack.

Here are all the things that you can edit using texture packs in minecraft.

/achievement The achievements screen GUI.
/armor All armor in game.
/art All paintings in game.
/environment Snow, rain and clouds. Also contains Sun and moon after snapshot 13w02a and Minecraft 1.5.
/font In-game font.
/gui Item hotbar, inventory screens, Minecraft logo and menu background. /gui/items.png is no longer used after snapshot 13w02a and Minecraft 1.5.
/item In-game models for items such as signs, carts, boats, arrows, and Chests. The doors file is not used.
/misc Biome grass/foliage color, overlay for pumpkin helmets, the clock dial, footprint, explosion particles, the End's sky color, the map background, and the Biome fog color. (and more…) tunnel.png is tiled on each face of the End's skybox in a 16x16 grid.
/mob All mobs in game.
/terrain Sun and moon. The image is horizontally flipped in the game. (any words drawn will be backwards until sunset, and then they will be forwards) Not used after snapshot 13w02a and version 1.5.
/textures/blocks What used to be in terrain.png. Only used in 13w02a/1.5 or later.
/textures/items Everything that used to be in gui/items.png. Only used in 13w02a/1.5 or later.
/title panorama pics, mclogo, black.png, mojang, and splashes.
You can go to this link to see a variety of texture packs in minecraft.

http://www.minecrafttexturepacks.com/

To learn more about texture packs, go to this link.

http://www.minecraftwiki.net/wiki/Texture_pack

My favorite texture pack in minecraft is the "Sphax pure BD craft x128" texture pack. You can look for it online.

Do not listen to Midnight. He/She is either trying to lead you to a hassle, or he either cares about getting free points rather than helping you.

I hope this helps! If you have any questions, please reply to them in the comments box.