This images have no copyright, use them wherever you want.
How to use them? see the example:
pick a catchy title and content and add them to the images. Example:
| Cover | Background |
|---|---|
 |  |
1. Mugs
| Cover | Background |
|---|---|
 |  |
2. Books
| Cover | Background |
|---|---|
 |  |
3. Code
| Cover | Background |
|---|---|
 |  |
4. Various Shapes
| Cover | Background |
|---|---|
 |  |
5. Spheres
| Cover | Background |
|---|---|
 |  |
6. Torus
| Cover | Background |
|---|---|
 |  |
7. javascript
| Cover | Background |
|---|---|
 |  |
8. python
| Cover | Background |
|---|---|
 |  |