Get Terraria Texture Pack 1.4.1.1 Background. Here you will find the best texture packs for terraria. This information applies only to the desktop version of terraria.

Toxijuice's Dark Inventory Slots (UI) - Terraria Texturepacks from terraria-texturepacks.com

1.4 will bring many changes to the pc version. All the blocks in this texture pack have been updated to the terraira style so you don't. This is in texturepack format (which means the zip file contains png files and not xnb files) so you should unzip it into a newly created folder in your resourcepacks folder.

I downloaded the calamity texture pack and put it in the folder but nothing has shown up.

This information applies only to the desktop version of terraria. All the blocks in this texture pack have been updated to the terraira style so you don't. They don't gain enough attention to warrant keeping them around. The texture pack has another edition the terraria halloween edition but this is not yet up to date with minecraft 1.4.