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The gaps around these pipes have been filled with expanding foam. After sanding the foam back and cleaning it off the pipes, 
What would be a suitable paint.
Are “sample pots” available in exterior paint and colour matched.
I presume interior paint is not an option.
Welcome to the Bunnings Workshop community @Glendav. It's sensational to have you join us, and many thanks for your question about neatening expanding foam.
It looks like the expanding foam might have been applied over a partially completed mortar fill, so removing the foam entirely and finishing the gap with mortar could be a neater and more durable solution. A properly smoothed mortar joint will blend seamlessly with the wall and provide a polished appearance around the pipe. However, if you prefer to keep the foam, painting it can enhance its look.
Start by sanding and shaping the foam for a smooth, even finish, then clean the surface thoroughly to remove any dust or residue. For painting, use a high-quality exterior paint to ensure durability and protection against the elements. While sample pots aren’t available in exterior paint, you can purchase a 1-litre can in your desired colour, which can also be useful for touch-ups in other areas.
Please let me know if you have any questions.
Mitchell
Welcome to you as well, @cos
You might like to share an image of your situation with our helpful members so they can assist you further. Let me know if you need a hand uploading one.
Does your pipe also have expanding foam around it at the joint?
Mitchell
