iwongu

This is a plugin that enables you choose images in Google Photos and inserts them in img tags in text mode post editor. This plugin requires you create a project in Google Developers Console to have your own API credentials.
Here are steps to create your own API credentials.
<ol>
<li>Create a project in <a href="https://console.developers.google.com/" rel="nofollow ugc">Google Developers Console</a></li>
<li>Enable <code>Google Picker API</code></li>
<li>Create a API key (Browser key)</li>
<li>Create an OAuth 2.0 client ID
<ul>
<li>Add your blog hostname (e.g. http://foobar.com) in <code>Authorized JavaScript origins</code></li>
</ul>
</li>
<li>Set the browser key and OAuth 2.0 client ID in the plugin settings menu.
<ul>
<li>You can find the plugin settings menu in <code>Settings -> Media</code></li>
</ul>
</li>
</ol>

Google Photos Picker

This is a plugin that enables you choose images in Google Photos and inserts them in img tags in text mode post editor.

Grigory Metlenko

Shortcode that lets you display your public Google Albums as a photo gallery on your website

Grisha's GPlus Gallery Shortcode

Shortcode that lets you display your public Google Albums as a photo gallery on your website

Google Photos Picker vs Grisha's GPlus Gallery Shortcode