*THANKS KONTAL FOR THIS TIP*
You need two jpg pictures and one colour scheme to do this.
1.Copy a picture with file manager.
2.Go to drive b
3.Click skin
4.There are 3 files,2 jpg files and 1 .col file.
5.Rename your own files as them.
6.Remove skin's 3 files.
7.Paste files that you renamed before.
8.Restart your phone.