Not sure if this is possible, but it would be amazing if custom Icons were displayed in the IDE in the same way the MaterialIcons show up. This means when you're auto-completing, you would see the icon on the right-hand side of the pop-up window. Once it's set, you'd see the icon in the Gutter next to the Breakpoint indicators.

For example, it would be really cool if something like the font_awesome_flutter package I've published, or a custom Icon set created by end-users would display a preview of their own icons.

The MaterialIcons preview feature is really handy, so it'd be cool to see this functionality available for all icons!