Sometimes you can't find all the icons you need in Power Apps, using the default icon control. With SVG's, you can add a range of great icons to your apps and even control the color of the icons unlike importing an image file.
Checkout https://ionicons.com/ which has a great library of free open source icons you can download. Check out the video below.
Formula for the image control: "data:image/svg+xml;utf8, " & EncodeUrl("ENTER SVG CODE HERE")