Bob Wyatt's Dirty Duster is an excellent impressionistic emerger pattern. The 3D (Double Dirty Duster) is essentially Bob's pattern, with a fun play on words. Call it any name you wish and tie/fish it, or ignore it at your detriment  :cool: 

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3D (Double Dirty Duster)
Hook: Partridge YK4A #12
Thread: Benecchi 12/0, tobacco
Hackle: 'Dirty' badger
Body: Hare's mask
Rib: Tying thread

Video here - please view in HD, if able:

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Cheers,
Hans W