A sampler card for you showing Dotty Edges. No rules for this other than placing dots around the edge of a design. I chose to extend the colour to the edge of the cut out and then to match the dots to the colour. Had I coloured just to the frame and left the border white, it would have a different look. That's the beauty of techniques with more than one method.
The colour for the image began with chalking and then I watercoloured ink into areas I wanted darker. This shows the card against a light background and this one.....
is against a dark background with the flash. The first photo shows truer colour.
This is another version using Dotty Edges. I used Spotlighting and then the dots to cover the circle edges. Another fun technique and I'm sure you could find many more samples online.
Thanks for looking and I hope you have a spectacular day!