Share 'Closed Curves / Cells from arbitrary grid of Lines / Curves'

Hi,  I hope that the title says it all, but in case it doesn't I'm trying to take a 2D pattern of overlapping lines (like 5000+) and create closed polylines/curves for every space (cell) in between the overlapping curves. It seems like to me that there could possibly be a simple solution to this using a .NET custom button, or even within the grasshopper buttons, but I'm struggling to pin that do…