Here is a variety of RSS Feed Icons so you can find one to match your style and your site! I only picked icons that I would use myself, given the fact I hate compilation lists with ugly icons.

Traditional Style

Feed Icons.com: The “official” site for feed icons. Traditional style in two sizes (28×28 & 14×14 pixels). They also offer 50 12×12 pixel icons in different colors based of the Photoshop palette.

Perishable Press: A collection of different sized traditional RSS icons, as well as differently colored ones.

Zeus Box Studio: A collection of icons, in orginal style and original style with added elements.

Grunge Style

Customize.org Grunge Feed Icon: They come in three colors: blue, red, and green. 128 x 128, 64 x 64 and 32 x 32 pixel sizes available. One of the icons come in a lovely floral style.

Glass Style

Bitt Box: Over 200 glass style feed icons in different colors. Available with and without reflection.

Snap 2 Objects: Several different neon-colored rss icons in a square shape. Available in .PNG and .PSD formats.

Square and/or 3D Style

Fast Icon: One free square 3D icon, with a bit of a glossy look for download.

Utom Box: Two different sized square icons.

Web Fruits: Keep it classic with a wooden icon!

Pete MH: Simple shiny square icon free to use.

Circle Style

Fast Icon: Four pairs of different colored icons in a circular shape.

Photoshop Star: Sticker/badge style icons. Comes in .PSD format.

Bati: Shiny circular icons, the author notes “free use for blogs”.

Cartoon and other Shapes Style

Smashing Magazine: Four creative ways to display an RSS icon. Show your uniqueness with these beautiful icons. Enjoy a cup of RSS coffee or read your RSS in the newspaper!

Smashing Magazine: Fun cartoon holding the icon.

Feminoise: Guitar pick shaped icons

Dock Icons: Cube shaped icons, brings two icons with different colored edges.

Design Freak: Have these kids show your feed icon.

X cChris: Show you have a rock solid feed.

Very Original Concepts

Davinness: Let people feel they can learn things on your feed by having the icon on a blackboard.

Design Freak- RSS Candy: Icon stored inside a clear candy wrapper! Very original concept!

Sheiladee- Drink up my Feed: Water fountain drain image that may be used as an RSS Feed icon!

Deviant Dark: Several original icons including a broken light bulb and a computer mouse.

Cavin: Have an acidic feed.

S-W: Use a Mini Cooper icon.

Sniffels: Wax Seal icon.