Today Elevenfour released the first wave of compatibility updates for selected plugins and styles to upgrade to WoltLab Suite 3.1.
Makani is a new dark style with yellow color accents and was released today. Makani focuses on improving the accessibility of your WoltLab Suite. Compared to some other styles it has better color contrast, links are easier to identify and - as with most styles by Elevenfour - the font size is truly reponsive since it adapts to changes of Browser's default font size.
You'll get more information on this style if you visit the download page of Makani. You get the style via Elevenfour's package server directly from your ACP.