OneWeb is a free universal template for Joomla 2.5, with a minimal design. Joomlafuture realized this nice theme on a fluid grid with multiple module positions. OneWeb use HTML5 and supports GoogleFonts. The clean and semantic source code garantuees the lightweight and fast loading work of this template. The download is free via Github. You can use this template for all website topics. 

Cloudbase 2.0 based on RocketThemes Gantry Framework and is thereby very flexible. Its layout comes on a 960 grid system and will be delivered with 60 module positions, 11 preset colors and 10 background patterns. Every module has a equal height. A fine feature is, that you can set a special color for every template element. The author provides this template with a autotheme for iPhone and iPod Touch mobile. Cloudbase 2.0 is free and native to Joomla 2.5. You can use it for every website in Joomla.

LeoThemes Leo Restro template comes with 3 theme colors. This free template for Joomla 2.5 is best suitable for mobiles, like iPhone or Android handhelds. It based on Leo Framework and works with CSS and Javascript compression. LeoTheme delivered this theme with multiple layout options and K2 Component support. Leo Restro is cross browser compatible to all popular browsers, like Chrome, Internet Explorer 7+, Firefox 2+, Firefox 3, Flock 0.7+, Netscape, Safari and Opera 9.5. You can use this lightweight and fast loading template also in Joomla 1.7.