I found a huge amount of folders here that you might like.

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In order to not make this a useless entry here are the unorganized folders on UserLogos.
Other folders you might like (click on them, many have more than one icon):

Folders2, by euphonicnight.

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Folders, by me.

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Folders, by euphonicnight.

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Ham Radio folder, by euphonicnight. Part of the Folders series.

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Favorites, by euphonicnight. Part of the Folders series.

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Money folder, by euphonicnight. Part of the Folders series.

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Generic Icons, by Macleod.mac.

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Money folders, by Melvbot.

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Sports folder, by Mtlca401.

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Shopping folder, by Mtlca401.

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Folder, by mudfrog.

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Mail folders, by Macleod.mac, me, and Sjdvda respectively.

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Generic Folders by Macleod.mac.