The charge is some symbols found on the screen itself. They can be in the background, the usual or both. There may be a large charge or several smaller ones. You can use everything as a fee, but many people choose things like objects, people or animals, and the symbols you choose should represent you. However, when it comes to colors, you should never add color to metal or metal. (The colors are red, blue, green, black and purple. The metals are gold / yellow and silver / white).
A good source of symbols and what they mean would be this.