The latest YouTube TestTube experiment is called Cosmic Panda, and it brings a great new look to the YouTube experience.

The new design, available to test out at youtube.com/cosmicpanda, changes the way playlists, channels and even standalone videos are presented.

Here’s what YouTube says about the new look –

So what the heck is Cosmic Panda?

We’re always trying out new things here at the Tube and Cosmic Panda is our way of letting you in on some of the fun.

Here’s what to expect when you follow the cosmic panda over the double rainbow:

• A new experience for watching videos and playlists
• More page designs and better editing tools to customize your channel
• Keep watching when moving between videos, playlists, and channels (Chrome only)
• Stylish new look and feel

You can always jump back to the YouTube experience you know and love by coming back to this page or visiting TestTube.

The gray has been replaced by a slick black background and video border. Related videos have been redesigned on the right and the total hit bar and like/dislikes looks a little different as well.

Playlists also have a brand new look, check it out –

As do channels –

On the YouTube blog, they encourage your feedback. So if you want to see the Cosmic Panda design (or at least part of it) integrated into the standard YouTube design, let them know.

Do you like the darker, sleeker look? Let us know in the comments.