Pipes can be sealed with expanding polyurethane foam. A decorative collar can be fitted around pipes or the pipes can be morterd up.
Depends what material they pass through.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!