If you are working on a sophisticated homeware application or a website and cannot figure out how to solve the UI problem under a fixed deadline, try one of the most comprehensive and professionally-looking icon sets - Small Homeware Icons!
Downloads: 41736 - Demo - Download Now

Sib Icon Converter allows you to convert multiple digital images and photos to Windows icons in one action. It also breaks down entire icon libraries into individual icons. You can change color resolution and size to create customized icons.
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Desktop Business Icons is a collection of stock icons that includes a variety of images related to business and finance. It is created by professional graphic designers and provides you with the top quality images in a variety of sizes.
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Red Toolbar Icon Set might not be the most exciting icons available, but we've infused ours with an attractive and clever design that you and your users will love. Fill your toolbar with the right symbols for a better chance at success.
Downloads: 42206 - Shareware - Download Now

Here is an iPhone Application Icons package, which will help each iPhone or iPad application developer get their GUI in order. The icons from this package can be used in navigation, tab bars and toolbars of iOS applications.
Downloads: 41299 - Shareware - Download Now