Basic Icons for Vista and Windows 7/8 is a set of brilliant stock icons designed in the same style as Windows 7 and Windows Vista icons. With their help, you can spice up your software or website to create an eye-catching layout, which Vista and Windows 7 users will find very familiar. The icons come in two versions: with or without shadows and delivered in various sizes and formats in 256 colors and 32-bit True Color (16.7 million colors with transparency). Look at design in perspective and use the icons crafted in the same style as Windows 7 icons.
777 Icons also plans to release the following icon sets: Android Status Bar Icons, Facebook Toolbar Icons, Delicious Toolbar Icons, Web Button Icons, Catalogue Button Icons, CRM Button Icons, People Button Icons and Vector Button Icons.

You can create icons yourself with an icon editor from http://free-icon-editor.com/

Junior Icon Editor is an award winning freeware icon editor. It is an all-in-one solution for icon creation, extraction and editing. It is designed to work with Windows XP, Windows Vista, Windows 7 and Macintosh icons supporting transparency.

You can easily convert your favorite images into icons, or icons into images. Junior Icon Editor gives you the possibility to create icon libraries or change icons inside exe files. Create a favicon for your website or blog.

Convert your Macintosh icons to Windows icons and vice versa. With Junior Icon Editor you can extract icons from other files, including Windows Vista, Windows 7 and Macintosh files. You can easily work with multiple files using the batch processing capability of Junior Icon Editor.