I made a template highlighting module to help Telescope users theme their site. Red labels are individual templates, and blue labels represent module zones (Telescope-specific template hooks), and they show up when you hold down the tilde key.
The code could theoretically work in any Meteor app, but I did have to tweak Telescope’s layout/CSS to make sure the labels and highlighting elements were displaying properly.
This uses @aldeed’s template-extension package by the way. And you can check out the (pretty ugly) code here.