How about this:

<$button set="$:/themes/tiddlywiki/vanilla/settings/backgroundimage" 
setTo="FirstImageTiddler">
    Image 1
</$button>
<$button set="$:/themes/tiddlywiki/vanilla/settings/backgroundimage" 
setTo="SecondImageTiddler">
    Image 2
</$button>

If you want an action widget instead because you want to be able to do 
multiple actions on the same widget, you could instead use an 
$action-setfield widget, like:

\define setAction(imageName) <$action-setfield 
$tiddler="$:/themes/tiddlywiki/vanilla/settings/backgroundimage" 
text="""$imageName$"""/>

<$button actions=<<setAction "FirstImageTiddler">>>
    Image 1
</$button>

On Friday, February 19, 2021 at 1:36:49 PM UTC-6 
zela...@mail.fresnostate.edu wrote:

> I have a button to switch between dark and light mode, but I also have a 
> background picture and not a default background color.
> How do I change the background picture in click of button? 
>
> thank you !
>

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