Maarten Lambrechts has a huge collection of weird graphics which he calls Xeno graphics
Xeno.graphics is a collection of unusual charts and maps, managed by Maarten Lambrechts. Its objective is to create a repository of novel, innovative and experimental visualizations to inspire you, to fight xenographphobia and popularize new chart types.
For example: Maptrix
Like origin-destination maps, MapTrix overcomes the clutter associated with a traditional flow map while providing geographic embedding that is missingin standard OD matrix representations.