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/AVvXsEiCX6685yhF7n2dAAbWdKRRj4TcBWdOhOPl4NPBwMw9RIeeC46eeO6jYaPZkawjHN_pA5oLYFC8K-sF2XgS-HDReVebEl2rg5IFV43EWrZuPD1JLidOUSTGeCFpAMZAKRlsgr4wr43_AGU/s1600/Customizable+green.png
Background URL :
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZ04Qhba02bXJCDWqQ5I8Zb_Ne6vHgQ2o5rr3qNHosuUt83JhSGTKB5__OmLd5SNw5oWsoZ6EHenp4cnSZ6PGcdvB67FqZDm34rMJmRysUeLSa7Jxm2seSrcDmdmwv-vY9KFOpT4uLcXA/s1600/background+green.png
Footer URL :
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtTra95VyH-jHiFEicS9ecbg1VCRB1QY7PH0bxImWVrJb15YIodfJ-A2NdF5EuSN8xujpE0TivtiDjbbTY6cC4X81zBdkSSWsuMxnzTfbBtN3GEnEx-xbd_6XFiYixNd5uzfoIN__m7g0/s1600/footer+green.png