Simplistic Resource Packs
Well, you can understand everything by reading the title of this pack. Simply HD Resource Pack is more likely a simplystic texture pack but also a HD pack.
PureSimplicity Resource Pack is a good textures with a beautiful lighting effects and well-designed blocks in a great style. PureSimplicity is a great pack which you can use to build a great and at the same time, very beautiful building!
Simple As That resource pack is a very and very simlistic textures, they are more likely not 16×16 but 8×8 which are for people who want more simplistic gameplay!