Another complex tool I wrote is about placing SVG-Shapes in a grid, based on the alpha of an black-and-white image.

With this tool you can controll the grid in X & Y direction, the Size, the rotation, grid offset and some other specials – see yourself:

 

Simple grid with no rotation or offset.

 

Grid with rotation and offset.

With nonlinear sized shapes.

 

Ramp used to create the grid.