ClagCraft is a super simplistic texture pack. Most of the blocks and items have got new textures and everything look very clean and smooth. The texture pack look especially good in natural worlds and for medieval builds. If you are looking for something simple and less pixelated than the original textures in Minecraft then ClagCraft is a good option.
(On the download page make sure to select the download called “ClagCraft Pocket” and then the right version.)