In this Grasshopper Dendro example file, you can use the Trap Field component from the Heteroptera plugin to generate a series of random connecting curves between two faces. Example File
In this Grasshopper example file you can connect two SubD surfaces using a series of lines and then convert the top to a multipipe structure. Free Example
In this Grasshopper Dendro tutorial, you can learn how to create a growing mesh by defining a series of spin fields on a NURBS surface using the Heteroptera plugin. More info