Create my own themes?

Is there any way? I know it's possible to save a theme in Windows itself, but I want to create complete themes like these here https://support.microsoft.com/en-us/help/13768

You could copy the system ones in windows (standard theme C:\Windows\Resources\Themes & High Contrast are in C:\Windows\Resources\Ease of Access Themes folder) and use them as a template to learn. Open them in Notepad and once you create a theme, Windows Themes can actually create the installer for you by right clicking the theme in your Windows Themes and select Save Theme for Sharing.
Your themes are stored in your Users folder under C:\Users\YOURUSERNAME\AppData\Local\Microsoft\Windows\Themes

Use this shortcut while in High contrast mode and you can edit the Background colors.
Color and Appearance shortcut - Create in Windows 10 - Windows 10 Forums[1]=Shortcuts

SonicBlue said:

You could copy the system ones in windows (standard theme C:\Windows\Resources\Themes & High Contrast are in C:\Windows\Resources\Ease of Access Themes folder) and use them as a template to learn. Open them in Notepad and once you create a theme, Windows Themes can actually create the installer for you by right clicking the theme in your Windows Themes and select Save Theme for Sharing.
Your themes are stored in your Users folder under C:\Users\YOURUSERNAME\AppData\Local\Microsoft\Windows\Themes

Use this shortcut while in High contrast mode and you can edit the Background colors.
Color and Appearance shortcut - Create in Windows 10 - Windows 10 Forums[1]=Shortcuts

Thanks.
Yesterday, I tried to simply copy some images from a theme in another theme. I merged 2 themes, essentially.
Well, for some reason, Windows skip some images after a few seconds, even if I set the skip period to 30 minutes. Is this just a bug?

Merging might create conflicts. At the bottom of your theme is the section for backgrounds.
Use this template from one that I created. Note the folder location must be created first " e.g. DarkKnight" and a folder in it must be named "DesktopBackground"...........all located in..........C:\Users\YOURUSERNAME\AppData\Local\Microsoft\Windows\Themes
Then when your done making the theme you can save the theme for sharing it will encode the Slideshow in the theme.
WIN7 and Win10 themes are the same.
The "Interval" is the time so not sure on the math but i think 900000 is like 15 min.




[Slideshow]
Interval=900000
Shuffle=0
ImagesRootPath=%USERPROFILE%\AppData\Local\Microsoft\Windows\Themes\DarkKnight\DesktopBackground
Item0Path=%USERPROFILE%\AppData\Local\Microsoft\Windows\Themes\DarkKnight\DesktopBackground\dk1.jpg
Item1Path=%USERPROFILE%\AppData\Local\Microsoft\Windows\Themes\DarkKnight\DesktopBackground\dk2.jpg
Item2Path=%USERPROFILE%\AppData\Local\Microsoft\Windows\Themes\DarkKnight\DesktopBackground\dk3.jpg
Item3Path=%USERPROFILE%\AppData\Local\Microsoft\Windows\Themes\DarkKnight\DesktopBackground\dk4.jpg
Item4Path=%USERPROFILE%\AppData\Local\Microsoft\Windows\Themes\DarkKnight\DesktopBackground\dk5.jpg
Item5Path=%USERPROFILE%\AppData\Local\Microsoft\Windows\Themes\DarkKnight\DesktopBackground\dk6.jpg