How can can I merge a picture onto my desktop wallpaper?

Question

Also, could you tell me what is the best way to fill scratches on wooden furniture, the scratches are pretty deep?

Answer 1

Your desktop wallpaper is a picture.

If you are asking how to merge two images, that can be done with an image editing software, like Photoshop or better GIMP, which is free.

If you are asking, how to use an image as your Desktop wallpaper, then right click on the desktop ->properties -> desktop and there you can browse your computer for the file.

Not all image file formats are supported.