A Brush that creates a trail of images of cellular creatures, based on petri dishes and microscopes. Best used for backgrounds or patterns.
The Agar Brush is a spray brush I made using various images I drew as and turned into pen tips. The brush creates a trail of these cell drawings in a random order.
You are able to change the colour of the brush, along with the opacity, the particle size, the thickness of each particle, the density and spray deviation in the tool propeties, along with some other options as well.

The Brush is meant to replicate imagery from microscopes of cells, bacteria, microscopic organisms, etc. The best way to achieve this is by using a smaller particle size on the bottom layer, then adding more layers with a larger particle size whilst decreasing the opacity. Though, the brush can be used in a number of different ways, such as below, where it depicts plankton and algae swimming in the sea.

I think it works best for background pieces for your artwork, but you can use it for other things as well. See what you can create with it.