In my ‘Minecraft Let’s Play’ videos I use a resourcepack I put together myself combining multiple ones made by the community! Because of legal reasons I can’t give out my version, but I can link to the packs I use!
For the awesome custom sky and lighting effects (Requires the Optifine mod): http://goo.gl/c5ZRS3 (Minecraft Forums)
For all textures such as blocks, items, and mobs: http://goo.gl/5JBSEJ (Minecraft Forums)
Get the Optifine mod (Helps to optimize and Prettify your Minecraft!): https://optifine.net/home