Baryonic is a new free Joomla 3.x template by Crosstec, which is still native to Joomla 2.5. Its bleached layout is very unique. Crosstec designed a same style for the drop down menu. 2 menu styles are available in the free version. You can get 2 other in a commercial version. The used image slideshow is responsive, adapt its width automatically to every device. Baryonic can be used universal. The download is free. Crosstec provide this template also in a commercial version with much more features.

In these days, Yootheme present YT Square, its template release in November 2013, which is powered by UIKit. This helps you to build powerful websites by HTML, CSS and JS extensions. Yootheme equipped this template with their own widgekit, which includes beautiful sliders, galleries, accordions and many more. You can choose of 8 pre-defined color styles. The integrated ZOO extensions garantuess nice styles for special contents, like blogs or documentations. YT Square is responsive, by the used Warp Theme Framework, so you can use it for any website content in Joomla 2.5 and Joomla 3.0. 

Joomlabmaboo's Flux is powered by Bootstrap and Zenkit, a content extension to build beautiful websites with K2 content. For this, also Zentools is onboard. Joomlabamboo includes LESS compiler. This allows you to build simple LESS code to speed up your website. Flux's layout comes in 8 preset styles and based on T3 Framework V3. You can use your website thereby for any device. The download is commercial. Flux is native to Joomla 3.x.