Attached Link: http://www.webelectricmagazine.com/98/3/etch.htm

Something like this?

I took the picture on the linked page (found it with a google image search), grayscaled and cleaned it up in Photoshop, then used it as a bumpmap with a strength of 0.05 and 0.05 U and V scale (that's P5 - you might have to do something else in P4.) That photo may be copyrighted, so if you want to display the results you might need to seek permission of the site owners. That goes for any PCB pic you download.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire