PlantUML is very powerful when you would like to create standard UML diagrams.
But I currently think about using PlantUML to document EIP routes (like the routes on these images: https://www.google.de/search?q=camel+route&safe=off&source=lnms&tbm=isch).
This would be pretty easy if you could specify another image instead of normal boxes for a class. Something like an SVG or WMF image or a shape script as in Sparx Enterprise Architect.
The only custom images I found in the documentation where those tiny sprites...
From PlantUML's Language Reference Guide
11.6 Legacy HTML
Some HTML tags are also working:
<img:file> : the file must be accessible by the filesystem
<img:http://url> : the URL must be available from the Internet
It appears that it shouldn't be a problem. There is also a PlantUML Word Plug-in, that would possibly enable you to paste images over the default ones otherwise.
The following PlantUML code renders a simple diagram - the referenced images have to be in the proper location...
object "inbound message" as m1
object "XML Splitter" as s1
m1 : <img:MessageIcon.gif>
s1 : <img:SplitterIcon.gif>
m2 : <img:MessageIcon.gif>
m1 -> s1
s1 -> m2
plantuml-icon-font-sprites allows using font-awesome icons within plantuml. It's awesome!
来源：https://stackoverflow.com/questions/34364024/is-it-possible-to-use-custom-images-for-uml-items-in-plantuml