And for photo editing, the theme should consist of neutral colors; vividly colored window elements are distracting, and may distort your evaluation of the image colors. Some people even paint their digital darkrooms gray.
You can simply change the colors by yourself.
The best way to do this and keep the org. theme untouched is:
Create a text document eg. “MyTheme-GTK3-20_.css” and copy the color defenition from the desired TooWaBlue theme into the document. You don’t need to copy all, it’s enough when you copy only the ones you want to change. The first line should be "@import "TooWaBlue-GTK3-20_.css";
for the standard or @import "TooWaBlue-Dark-GTK3-20_.css";
for the dark theme. Copy your theme to the theme folder and select it in RT.
@import "TooWaBlue-GTK3-20_.css";
/*** Change me *** rgb(red,green,blue) *** allowed values from 0 to 255 for each color ***/
@define-color accent-color rgb(35,99,166); /*** Active color for Lists, Menu, Borders ... * Default: rgb(35,99,166) ***/
@define-color text-hl-color rgb(210,210,210); /*** Active text color * Default: rgb(210,210,210) ***/
@define-color bg-highlighted-text-color rgb(35,99,166); /*** Highlighted text color background* Default: rgb(35,99,166) ***/
@define-color highlighted-text-color rgb(210,210,210); /*** Highlighted text color * Default: rgb(210,210,210) ***/
@define-color bg-image rgb(70,70,70); /*** Image area & File Browser background * Default: rgb(70,70,70) ***/
@define-color accent-color2 rgb(35,99,166); /*** Scale, Progressbar, Scrollbar, Tabs * Default: rgb(35,99,166) ***/
@define-color accent-color4 rgb(115,115,115); /*** Slider knob * Default: rgb(115,115,115) ***/
@define-color accent-color3 rgb(35,99,166); /*** Selected thumbnail background color * Default: rgb(35,99,166) ***/
@define-color text-hl-color3 rgb(210,210,210); /*** Selected thumbnail text color * Default: rgb(210,210,210) ***/
/*** Change me end *****************************************************************************/
@define-color bg-light-grey rgb(90,90,90);
@define-color bg-grey rgb(70,70,70);
@define-color bg-dark-grey rgb(36,36,36);
@define-color bg-button-hover rgba(0,0,0,.25);
@define-color bg-button-active rgba(0,0,0,.60);
@define-color winHeaderbar rgb(55,55,55);
@define-color winTitle rgb(190,190,190);
@define-color bg-tooltip rgb(185,185,185);
@define-color border-tooltip rgb(36,36,36);
@define-color text-tooltip rgb(36,36,36);
/***********************************************/
@define-color text-color rgb(186,186,186);
@define-color text-tbEntry rgb(192,192,192);
@define-color border-color rgba(255,255,255,.30);
@define-color bg-list-hover rgb(50,50,50);
@define-color bg-scale-entry rgba(0,0,0,.14);
@define-color bg-button-border rgba(0,0,0,.60);
@define-color bg-entry-border rgba(0,0,0,.40);
@define-color view-grid-border rgba(255,255,255,0.15);
@define-color headline-big rgb(195,195,195);
@define-color headline-hl rgb(230,230,230);
@define-color headline-frame rgb(215,215,215);
/***********************************************************************************************/