The discussion revolves around the search for high-quality, free PowerPoint backgrounds. Participants suggest creating custom backgrounds using tools like Photoshop and Microsoft Paint, noting the scarcity of appealing options online, often hindered by heavy watermarks. One user shares their experience of modifying a grayscale MRI image to create a blue background but raises concerns about copyright issues when using images not owned by them in professional settings. The conversation highlights the challenges of sourcing visually appealing and legally safe materials for presentations.