Our Filter swatches only work with WooCommerce attributes at the moment. Below is how you set them up.
Go to Product > Attributes
Add your attribute and it's options. An example would be Color and then Red, Blue and Green.
When editing or adding the attribute, under "Type" - choose the type of swatch you want.
The color will show a color swatch.
The image will show images.
The label will show a label.
Add or edit each attribute items now. Depending on what type you selected there are different options.
Color - add the hex code of the color you want.
Image - add the URL of the image (you can copy this from the media library)
Label - nothing to do here.
Below is an example of the color swatch for blue
In the Filter module, add a filter item.
Choose product attribute, then choose for it to be a swatch and it will show as a color, image or label swatch.