Here are 10 CSS UI Kits will definitely help you work faster whether you use them for basic wireframing or a full design. Enjoy !
CSS for clean and fast web apps.
A Hand-Coded Designer CSS UI Kit
This free UI Kit is coded by hand using HTML5 and CSS3 so you can easily drop these elements into any project you’re working on. This code is made to take advantage of modern browsers and to degrade gracefully in older versions of internet explorer, so no matter what your client or visitor is using they will be see an excellent design.
Icon Deposit CSS3 UI Kit (PSD+CSS)
This includes everything from GUI switches and buttons, to radio buttons and checkboxes. I also included the Photoshop PSD file for those who want to edit the design or make the images bigger.
Gumby Framework’s UI Kit includes precooked buttons for you to use in your project’s UI. All you have to do is change color values to fit your site/project and you’re on your way to clickable button glory.
Sleek, intuitive, and powerful front-end framework for faster and easier web development.
Lion CSS UI Kit
For web designers wanting to prototype native apps for Mac OS X Lion.
ui.css is a tool for creating clean user interfaces for the web. The download includes a css file with styles for all the elements, including :hover and :active states.
Grid UI set
awesome little ui kit by designer Sven Read.
The link will take you to the comment where you can download the UI kit. The kit is almost entirely CSS (only two small images are used)
Light UI Pack is specially for modern web design. It made with pure css3 and works in all modern browsers.
Designer CSS UI Kit
This UI kit has been designed and hand-coded from scratch in HTML5 taking advantage of modern CSS3 techniques, it includes a range of common user interface elements and font stacks, which look beautiful in modern browsers and degrade gracefully in Internet Explorer.