Just because you’re using vector does not mean, that you design must be flat:
The Design was done in Adobe Illustrator, exported to svg and then re-constructed dynamically in my look and feel class. It’s quite involved - but well worth it in my opinion. Now I have realistic looking knobs that can be used at any size.
EDIT: And as an added bonus, it’s not to hard to export screenshots to PDF for inclusion in your user manuals - this way even your screenshots are searchable and look beautiful in all sizes