Where do you get your device graphics from?

Where do you get your device graphics from?

Hi All
 
I have seen some very fine network diagrams and rack diagrams from users of OpManager, could you tell me where you got your graphics (png or jpg) files from.  I have Visio with all the Del and HPl graphics and Rack graphics but I can't find anywhere that does them in jpg format? 
 
Thanks in advance for any info.
 
Eric

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