Congrats! And I wish you 100,000 sales very soon.
In a 3D software (3d Studio Max, Blender, Maya, ...) you will do a pattern from image (for example closed spline) and then using e.g. particle generator you can create positions inside pattern. Then you will place low polygon people inside the positions, rotate them around Z-axis randomly, place camera, lighting, ... and render the image in high resolution.
What? 23 000 + ... wau !!! Congrats!