For quite some time, Google has been testing a new look for the YouTube's embedded player with a balck bar. Now, the experiment of the look is over, and starting with August 10, all embeds will automatically be updated to the new "dark player"," announced Shannon -jj Behrens, YouTube API Team.
Here are all the new themes, including the new default:
"Although we're very excited about this change, which comes after months of design, research, and experimentation, we realize that some embedders would prefer a lighter color to match a lighter webpage, so we're also announcing a few other themes that we'll be making available. We also realize that some embedders would prefer something more mild than our use of red, so we're happy to introduce a "desaturated" color option without any bright colors at all. (Note: Using the desaturated color disables the modestbranding option.)," Behrens wrote.
To pick an alternate theme, pass in values for the "theme" and "color" player parameters. For instance, if you'd like to keep the traditional colors, you can pass parameters such as:
<iframe width="560" height="349" src="http://www.youtube.com/embed/9h1swnwgp8q?theme="light&color=red"" frameborder="0" allowfullscreen></iframe>
Here's a video with black theme:
[Source: youTube API blog]