If the glossy and shiny Web 2.0 style design is boring, how about the medieval and archaic feel grunge style? Here is a set of PNG format grunge style RSS feed icons in blue, red and green with various size 128×128, 64×64 and 32×32 px. You can free to use them what ever you want.
http://customize.org/icons/55872/

Damien has created a set of 460+ small web application icons - Silk Companion Icons, that is an addition and and variations with the popular Silk Icons from FamFamFam. Free to download and use under Creative Commons Attribution 2.5 Licence.

AjaxLoad is an online generator that allow you easily create custom animated loading indicators. Now there are totally 35 different types of indicators that you can select, such as the popular circle ball, indicator, rectangle bar, kit, arrows, square, snake, and bouncing ball. You can also customize the background and foreground color or transparent of the GIF loading image. Once finish the simple setting, press “Generate it” button and you would preview the custom loading icon before download it.

Iconize Textlinks with CSS is a simple CSS technique that allow you easily adding pretty tiny icons beside the text links. It’s very simple, for example if the link point to a Doc file directly then a small Doc file icon might show after it. Thereform the visitors can easily identify the file type of a link by its icon. There are almost 40 varied type small icons such as document, image, video, media and email. The CSS file has been tested successfully at Firefox, Safari, Opera and Internet Explorer 7. Download the file straightly and integrate the CSS file to your current design, and make sure correct the path of small icons. Enjoy!