General every site can be divided into two categories (according to their width), one is Fixed, which can’t change according to screen resolution (or the width of browser), the other is Fluid, which changes the width according to screen resolution (or the width of browser), here we have collected some Fluid Width WordPress Themes, may be one of your desire theme is here, what you are looking for.
4 Column Split, widget-ready theme in soothing Cream and Green colors. 2 sidebars on the left and 1 on the right. Fluid width that holds the layout down to 800px. Features an author box, author info page, gravatars and highlighted author comments in the comments section along with custom Archives, Sitemap and full width No Sidebars page templates. Tested in Firefox, Opera, Safari, IE6 and IE7. Compatible up to WP 2.7.
Magloss V2 is a 3 columns fluid width WordPress theme developed by MagPress. This flexible width theme is a newly improved version of our previous Magloss theme. This theme comes built-in features such as featured content slider, featured latest posts from category with thumb, customize single page with thumbnail related posts, Adsense ready, Twitter ready, enable user to insert up to 5 YouTube videos, etc. All these settings are controllable via easy to use theme options.
Really simple, 2 columns, fluid width theme. Perfect for technical applications and maximal WP performances.
GreenMild Free WordPress Theme:
GreenMild is a 4 columns fluid width WordPress theme developed by MagPress. This flexible width theme comes with an easy to use theme options and add-on features such as featured content slider, latest posts from category from thumbs, built-in related posts on single post view, Adsense ready, Twitter ready and more.
A dark green and orange colored theme with two columns and fluid width.
Musique WordPress Theme:
2 Columns, with blue background, fluid width WordPress theme.
Another among Flexible Width WordPress Themes, Evanescence is a simple fluid width theme with two column layout. Right hand sidebar supports widgets. Tags and gravatars supported. Valid XHTML and CSS.
A dynamic width theme great for all types of nature, gardening and green sites.
Fluid width, light on dark theme with lots of CMS features. Based on the rich semantics of the Sandbox theme. See the documentation and support forum.
A clean and very web 2.0 theme with customizable layout, colors, fonts and graphics. From the admin panel you can change the header image, background image, sidebar position, content and sidebar dimensions, paragraph indent, text colors, fonts, post metas (like author, category or date), background colors and a whole lot more. With over 40 theme options, 7 widget areas, social media animated graphics, multiple pins and bullets you can easily make this theme suit all your needs.
Multistyle theme from TwoBeers. Use one of the six default styles or mix them to get your personal one. Wallow has a lot of features, like five built-in new widgets, the quickbar (a fixed bar for your most important widgets always on top), customizable menu, background and header, widgetized sidebar.
EvoLve is a Premium WordPress theme with advanced features including lots of options. It features a modern design with up to 14 color variants, fully customizable layout, post excerpts with thumbnails, post boxes, author gravatar support, up to 10 subscribe/social customizable buttons, custom logo, header widgets, recent posts slideshow, footer widgets, custom footer, customizable font styles, custom CSS, ads spaces. The EvoLve theme also comes with custom Menus support and other cool features. Translated in Spanish, German, Swedish, Dutch, French, Russian, Turkish, Norwegian, Slovenian, Italian, Brazilian Portuguese. Tested with WP 3.1 and major browsers – Mozilla Firefox, Internet Explorer, Opera and Chrome.