Dendritic and Beyond...

Anticipating a Dendritic Techniques group swap sometime in 2017, I used a glass mirror for a base and a rigid plastic box cover 
to "smoosh" the acrylic paint layer between them.  
I should make up a tutorial, 
although YouTube has several.

My brief process description:
Either drizzle over, or place drops 
of acrylic paint onto, a non-porous surface.
Cover with another non-porous surface.
Press firmly, even using your thumbs/fingers 
to spread the paint between the two layers.
While you peel the two layers carefully apart,
you will see the Dendritic pattern forming.
(It reminds me of coral branches.)
You can control, to a certain extent, 
which way the pattern spreads out.
As you separate the two layers, the paint 
is deciding which surface to cling to.  Smiles

Then you can pick-up the patterns by pressing and 
smoothing good-quality paper or card stock 
onto one or both painted surfaces.
You may repeat the process with
the same color paint or a different paint color
to make layers of pattern.
Add collage or other designs as you wish.

I picked up the following patterns 
with some card stock:

This is a purple envelope I over-printed 

with acrylic paint/dendritic patterns:

My detour:

Then I drizzled paint over the glass/base, used a rubber brayer to spread out the paint, and watched the paint begin to move since it didn't adhere to the glass like it would 

to a Gelli Plate Printer.  Again, you get the paint 

separations which make the patterns.

These designs (and a little collage) resulted:

The pattern below suggested a pond reflection and trees so I drew in a shoreline, adding sky and water with watercolor pencils: