Related sites:
Newsletter: Perspectives on Power Platform
Company: Niiranen Advisory Oy
To create high quality visualizations for apps that can both scale to high resolutions as well as be dynamically manipulated via formulas, Scalable Vector Graphics (SVG) would be a great choice for Canvas Apps. While there is no native support for SVG features in Power Apps, you can bring in their XML definition and work with it to create a gallery to browse a complete library of icons imported from open source repositories like GitHub.