tgrk

Using Custom Logo you can replace WP default login/register page logo by placing URL to custom logo 
you have (in proper size of course ;)). It is done using JavaScript onload event. It is not ideal, because 
there is small delay. I will try to improve it as soon as possible(I created it because of need for one small 
project…). Reason for using approach is seamless WP upgrades without any need for backup wp-admin.css or 
changed wordpress-logo.png.

Custom Logo

Replace WordPress default login/register page logo with custom one.

Nicolas Johnson

Holiday Logo Switcher provides you a way to display a different logo depending on the holiday (or just the range of dates you want).
Follow the evolution of the plugin trough the <a href="https://github.com/multimedianj/holiday-logo-switcher" rel="nofollow ugc">Github repository</a>.
<h3>How it works</h3>
<ol>
<li>In Settings > Holiday Logo Switcher, you have the possibility to set a Default logo to display if you don’t have any holiday at the moment.</li>
<li>You can also set a dark logo in the Dark mode logo field, wich will be activated only if dark mode is enabled in your browser (this is compatible with the plugin <a href="https://wordpress.org/plugins/a11y-kit" rel="ugc">A11y Kit</a> wich has a dark mode setting that can be enabled and comes with pre-configured styles).</li>
<li>In the Holiday Logos menu, you can just add a logo by clicking Add New. After that, just configure your date range (from DD/MM/YYYY to DD/MM/YY) and click on Save.</li>
<li>To display your logo anywhere you want, just add the shortcode [hls] and that’s it.</li>
</ol>
This plugin was created and is maintained by WP inclusion, a <a href="https://wpinclusion.com" rel="nofollow ugc">glossary of Web accessibility terminologies</a>.
<h3>Compatibility</h3>
This plugin is multilingual ready.

Custom Logo vs Holiday Logo Switcher