Delta is a fresh, beautiful and free (open source) jQuery UI theme from Kiandra, they are open sourcing this jQuery UI theme. They have been using the “Delta UI theme” for the better part of a year and made the decision to share it with the community.

It’s free for commercial, personal and educational use as part of the MIT or GPL license.

• Retina ready – The theme makes use of CSS3 gradients and some @2x images to ensure it’s retina display friendly
• Dark and light friendly – The vibrant colour scheme means “Delta” works on both light and dark backgrounds
• OS dependent modals – Close ‘x’ and button placement inherits from your operating system, using an extra Modernizr test