Are there any tools that work with Wireshark to produce mesh network visualizations?

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I am not aware of any Wireshark tools that attempt the visualization you are looking for but you can integrate/botch Wireshark with external tools. For example you can use tshark (wireshark command line tool) to send the dissected packet to a third party application (maybe your costume GUI if you like).

If you are comfortable with python, you might want to look at a package named "Scapy". link text

You can use it to analyze and visualized captured packets and visualize it using that package and more python visualization packet.

hope that helped.