10

Looks like some post effect or maybe another technique. How to achieve this, any ideas? enter image description here

enter image description here

15

You could use the Wrinkle tool. It's located in the Tool bar as shown below. Double click the Tool icon to change settings as required. These are the settings I chose.

enter image description here

Then use the tool as you would normally use the Brush tool, over the edges of a rectangle or shape, until it's rough enough.

enter image description here

The other answer given covers the addition of stippling/shading. So I won't repeat that. However just to say that using the Wrinkle tool is a vector effect, rather than a raster filter.

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    That was my first answer that got some upvotes :D Feels great you mentioned it! BTW I like your approach more, since I also preferred vector output, but didn't know about this tool.
    – Vikas
    Jul 11 '19 at 16:34
14

Not sure about the exact effect, but you can use Illustrator's Effect > Pixelate > Crystallize to create a crystallized look for borders.

For those dotted 'gradients', you can either buy or create a stipple shading brush or you can find some free to use brushes, like these:

enter image description here

enter image description here

(Above image credit: The same blog (spoongraphics) which I mentioned above)

That will give you similar look.

Simple example:

  1. Create your two rectangles with some different colored borders.

enter image description here

  1. Apply effect to both of them. Then go to Object > Expand Appearance.

enter image description here

  1. Now you need to remove the unwanted border. For this use Window > Image Trace feature and then Expand it. Ungroup everything and delete unwanted shapes. You'll be left with this:

enter image description here

  1. Then use those Stipple brushes. Select darker stroke colors. And use Draw Inside mode.

enter image description here

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