Arty Borders
These techniques allow you to create a range
of nice borders very easily. Start with a basic picture you want to
work with:

Select the quick mask mode (Q) as show below. We
want to mask out the area that will be the border, I find its easier
to mark the border and then use Invert to get the selection required.

So after selecting quick mask mode, using the paint
brush and a large brush mark out a border around the picture, and
then click on Image -> Adjust and select invert (or
Ctrl+I). The red bit is what will be kept. You should have
something like:

Now we can play with the mask selection to get some
nice effects. Lets start with selecting Filter -> Pixelate and
choose Colour Half tone. Perhaps increase the pixel radius size a
little, I've used a radius of 10 pixels:


Now go back to normal mode (Q) or click the button.

This leaves a selection on the image, press Delete
to remove the selection, followed by Ctrl+D to turn off the
selection. You should have something like:


Variations to this are off course easy. Instead of
doing a Colour Halftone in step 3, try some others. Good ones to use
are also on the Filter -> Pixelate menu. For example:
Mosaic:

Colour Halftone (small radius) and Mosaic:

Fragment (x2):

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