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I have the same issue after 15.4 white lettering on white background, no custom colors just white.
 
A good way to make an image replacement. Useful for multiple Desktops too:

• Do a screen-grab of your monitor (Shift-Cmd-3)

EDIT ... (previous vs using Photos was April Fools... obviously)
• Open the grab in Preview
• Show Markup Toolbar
• Add a Rectangle that covers the whole area. (It can go beyond)
• Click on Fill Colour to open the Colours Palette
• Choose your colour (If you want to use HEX, choose RGB sliders)


• Save Changes
• Export
• Choose HEIC
• Least Quality

Save to your “Desktop-Backgrounds-that-don’t-break” folder and you’re good to go.
_________________________________________

NB… My MBPro is set to 'More Space' and the HEIC is 9KB. The OS will not need to resize it, because it is already the perfect size.

NB 3 for Geeks:
On the Colour Palette window:
• Choose the middle icon: Colour Palettes
• Click Ellipse (…)
• Add a New Palette and store your Desktop colours here. Now available wherever you are.

(NB 4.. you can drag colours into the Palette colours list area.)
 
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Spoke with apple they are prioritizing a fix. I asked Chat GPT to create a Wallpaper photo for me, then dropped its photo into Photos app and selected it in Wallpaper pref... a good and quick workaround in my case
 
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Picking desktop wallpaper colours from the Apple colour picker no longer works.

Same here...

I is a known bug mentioned in the main bug/fixes thread.


I was able to find an image at this web site that was pretty close to the blue/grey I was using. so all good for now.
 
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Same to me, turned to white after updating, and every time I try to select a custom color it goes back to white, it almost made me blind
 
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I'm joined the club now.
After update 15.4 on my 1 month old Macbook Air M2 . I get white wallpaper bug when using color custom.
 
Hard to believe we have to turn to image generation websites to create our wallpaper images, considering the amount of money we spent on our computers. Still love Mac, though
 
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Hard to believe we have to turn to image generation websites to create our wallpaper images, considering the amount of money we spent on our computers. Still love Mac, though
It's pretty easy to do with Apple's builtin Preview app.

Open any image file, and choose to Annotate it.
Pick the Rectangle shape.
Change its Fill Color to the color you want.
Draw a Rectangle.
Screenshot only the filled Rectangle.
Use the screenshot as wallpaper.

 
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