I have a few UIs and UXs that I'm proud of, but I don't know of many that I can share readily. Tabs are fine, but don't scale well. Often times when I want a tab I will end up replacing it with something else. An easy change that scales better is a single column listbox which inserts a VI into a subpanel instead. The listbox and subpanel can be in their own pane, and set to fit to the pane, and scale with it. I posted a few UI tools over the years like the Ribbon Interface toolkit, that can contribute to a nice UI. I have a sequence editor with drag and drop, looping, conditionals, go to's, that works pretty well. And I have used a set of images at the bottom as a tab replacement that shows icons along a process of setting things up. There is a back and forward button on the bottom that goes to the next step, or you can click on the icons at the bottom and it goes to that step in the process. This is a 2D picture control that can be updated easily with a new VI to be inserted in the subpanel.
This sequence runs on real-time so no TestStand, and has other normal shortcut features like copy, paste, delete, save, and select all. It also has file extensions so double clicking on a file opens it in the editor, and dragging and dropping a file to this window will work, prompting for unsaved changes if there are any.