Vector Field understanding

I dont understand Vector Fields to its fullest so i hope can answer my question. Can you use a Vector field to make a shape of something. i want to use particles to make a shape of something but not sure if it can be achieve with vector field or is there something else in cascade for it. Put a pic of the shape i wan to make with Partical. Also to get a total understanding of what i want to do is like in paragon Sparrows weapon on the trailer her weapon has particles has the shape of the arrow.