Give Your Prism App A Custom Icon
Currently when you create a new app with Prism, it doesn’t let you give it a custom icon as with Fluid. Well, it’s not a difficult thing to do. You’ll need an ICNS icon. If you don’t have one, you can easily create one from an image using Img2icns.
Step 1: Create your web app. In this tutorial, I’ll be using Gmail.

You now got your Gmail Prism launcher on the desktop.

Step 2: We need to edit the package contents to replace the default icon.

Step 3: Browse to the Resources folder where you’ll find an app.icns icon.

Step 4: Now take your application icon and rename it to app.icns.

Step 5: Drop it into the Resources folder

Step 6: Close the finder and your done!
