Here are a few sources of free high-definition photographs that are free to use, both for personal and commercial projects, and without the need for attribution.
Pixabay is one of the largest sources of free photos, illustrations and videos. There are over a million images available for download.
coolors.co is an excellent free resource for exploring and generating colour palettes. I recommend creating an account there so that you can save palettes for future reference.
Once you have decided on a colour palette for your website Using a plugin like Code Snippets it is then possible to add in code to customise the colour palettes available in WordPress
The following code will customise the theme colour palette in GeneratePress. You can have a variable number of colours, but they are only given the same amount of space regardless so if you specify too many the palette blocks will become very small. Seven or eight colour blocks is about right.
add_filter( 'generate_default_color_palettes', 'tp_custom_color_palettes' );
function tp_custom_color_palettes( $palettes ) {
$palettes = array(
'#000000',
'#264653',
'#2A9D8F',
'#E9C46A',
'#F4A261',
'#E76F51',
'#FFFFFF',
);
return $palettes;
}The code below will customise the colour palettes within the Gutenberg Block Editor in WordPress. As far as I know there is no restriction on the number of colours that can be specified here.
add_action( 'after_setup_theme', function() {
add_theme_support( 'editor-color-palette', array(
array(
'name' => __( 'Black' ),
'slug' => 'Black',
'color' => '#000000',
),
array(
'name' => __( 'Charcoal' ),
'slug' => 'Charcoal',
'color' => '#264653',
),
array(
'name' => __( 'Persian Green' ),
'slug' => 'PersianGreen',
'color' => '#2A9D8F',
),
array(
'name' => __( 'Orange Yellow Crayola' ),
'slug' => 'OrangeYellowCrayola',
'color' => '#E9C46A',
),
array(
'name' => __( 'Sandy Brown' ),
'slug' => 'SandyBrown',
'color' => '#F4A261',
),
array(
'name' => __( 'Burnt Sienna' ),
'slug' => 'BurntSienna',
'color' => '#E76F51',
),
array(
'name' => __( 'White' ),
'slug' => 'White',
'color' => '#FFFFFF',
),
) );
} );