How to embellish glass bottles with clay?

Hi, I am looking for a website or a book on easy instructions on how to embellish recycled glass bottles or bottles found at second hand store for home projects (for example spa bottles that could contain bath salts) using a variety of mediums like clay (mostly) artistict wire etc.
I am planning to give these bottles for Yule presents (Christmas) and have seen pictures in the internet as to how they look finished but I need a place with instructions etc. Is there anyone that knows about this here, please help I’ll really appreciate it 🙂 Thanx!