A data step property can be customised to appear in a range of colours.
This can be done by editing the relevant data step and selecting the relevant data step property to bring up the "Property details" box.
In the "Advanced" section, there will be a "Colour" field where you can expand the colour palette box to select the desired colour:
Once the colour has been changed, the colour of the data step property will be updated:
Similar steps can be made for other data step property types.