HermitCraft 16x16 is sort of an 'expansion' texture pack. It doesn't have very much in it, because it is only meant to chagnge some mobs, paintings, and the title. You can download it and use it, but ll the textures, items, etc. will be default. It has Randomobs support to make all the zombies different hermits =]
I don't really have experience posting a texture pack, so please tell me if I did this wrong =P
Using My Textures with Another Pack
Find the texture pack you want to use, the open the 'mobs' folder. Delete 'zombie.png' and drag all the zombie textures from my pack into the mobs folder. Then, open the villagers folder and replace my villagers with the other pack's villagers. For the hermity paintings, open the art folder and replace the 'kz.png' in the other pack with the one in mine. For the title and hermit face background, open the title folder and replace 'mclogo.png' Go back to the pack, open the gui folder, and replace 'background.png'
Sorry if this is confusing =P