How to create a pattern?

[Tengiz]

Hi! How can I make a pattern of spheres of different size on the surface of the object?
I'm attachin similar image.
Here it is seen that there is a smaller sphere between bigger ones. And there is always an exact distance between the spheres

[Tengiz]

I suppose, that the opportunity to create the pattern from spheres depends on the function of spreading.
May be it is possible to make spreading on vertexes, so that the particle appeared through each vertex on Mesh, and thereby big spheres could be located on  Mesh. 

I'll be greatfull for the help

To make this effect I have to create Shapes and generate particles on them. But this process takes much time...

[rolfinscher]

Hi,
have you tried emitting at vertices and control the scale via texture?
regs

[Tengiz]

Yes, At the end all the particles are scaled by vertex color, and gradient is assigned on them depending on the size.
But it's not cleared how to create the pattern in the very beginning