A RichText panel class that matches the word "boomerang" or "boomerang-item(s)" and replaces it with an icon. It sets ImagePath to a boomerang texture and hides the original matching text.
using Sandbox;
[RichTextPanel( @"\b[Bb]oomerang-items?\b" )]
public class RichTextBoomerangIcon : RichTextBase
{
public override string ImagePath => "textures/ui/boomerang.png";
public override bool HideText => true;
}