This is a bumper collection of 50 different seamless polka dot Illustrator pattern swatches. Put the .ai file in your Illustrator > Presets > Swatches folder. They are for personal use only. Get them HERE
How to change the colours in a pattern swatch
What? You want even more colours? Here’s how..
Once you have them open in Illustrator, you can change the colours by dragging them out of the swatches palette onto your artboard, and using the Direct Selection tool (the white arrow) to alter the colours. Then drag it back into the swatches box and save. See the image below..