Just copy the URL That I had given below each image
If you want to save it : Right click --> Save image as...
Header URL :
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1OAvq8rRKNTYMOBTYK0gkvfKQt5fpWv4xqgSordQkr4CODArP7SPUrzOUoYq2S8B3rBipBuBpB9Z747OURAnSPH6Z_A_sFAE8OXiiTkPpnBnwOEVpF8XKuUXt0ZzpIxh02C_5djBB26U/s1600/Header+custom+b.png
Background URL :
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0Tlq3PqZkBR9rs8ZSAdXDSaH8CUQzIa_9zX7od5xGWeEILYi3YWcAZMDX6O2ro1aNbzsSmY-Ff4049YN1JHgAJIrg27L_e9ugk-LeYaQQv8dMA0oVu05J1CwCKA8iRPDhvLiKN4H6ngg/s1600/background+blue.png
Footer URL :
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwOGInsQMjjSIoPw7IJpi3xpHy_GVqhlQMG6PfFkahiIT2Zhd3s6TL1M2JwxoexDkErGFTn1CXdcEeherTqcQ0ZgejYGCdak_q1M_IuNEE5wQ9vcgkhWVprD4juOn0XAOEaeMd6LE4ZnU/s1600/Footer+b.png