How find all the desktop appearance items like Windows XP

I have Windows 10 Pro, 64-bit.

I'm hoping someone can help with this. In Windows XP, I was able to completely modify all types of settings. In Windows 10, thanks to a previous thread, I was able to find a lot of them in Win 10, by going to Start/Run & using "rundll32.exe shell32.dll,Control_RunDLL desk.cpl,Advanced,@Advanced".

However, it doesn't cover all the things that Windows XP had AND I was easily able to save my settings as a theme in Windows XP.

1. Can someone please tell me where I can find additional settings in Windows 10?
2. Once I make changes, is there an easy way to save all the changes as a theme that I can name?

I've attached 2 screenshots: one of the items in Windows XP & one of Windows 10. So I'm looking for the place to make changes that aren't covered in the attached Windows 10 png.

Thank you in advance,

@phrab
Your first image represents the color palette for High Contrast themes,
your second image I don't recognize.

Edwin said:

@phrab
your second image I don't recognize.

Hi Edwin:
Thanks for the reply. The 2nd image is a summary that I made from the options in Windows XP. I right clicked the Desktop, went to Properties/Appearance tab/Advanced. This is the screenshot in WinXP.Then I listed all the items & their color schemes, made modifications, & saved the results in a chart in Word. I was just trying to list all the options that I had in WinXP that I can't find in Win10. I'm guessing they must be somewhere, but I don't know how to find them.

I wouldn't know how to find them either!
Those settings are long buried in the Registry, in Stylesheets and various .dll's all over the place!
To access a small portion of those, I'm almost certain it will take 3rd party software to do it.

Thank you very much for the reply. I've been looking, but can't find 3rd party software that does this. Do you (or anyone else) know where I might find some?

[QUOTE=However I find background colours are lost on resume from sleep/hibernation, so had to take special steps to automatically reapply what I created as a custom theme on resuming..[/QUOTE]

Thank you so much for showing me this! I will try this ASAP. And thank you Superfly!

Once I make the changes, how do I save it as a theme & reapply it?

Thank you again!! I appreciate your time & expertise. I'm new to Windows 10 & was afraid to click on "Unsaved Theme", not knowing what it would do. This might also solve another problem with Firefox, as I found that somewhere in between Theme2 & Theme3, I did something to make their menus unreadable when I hover the mouse. I will let you know.