Different kinds of physical buttons and dials to consider.
Braun Regie 308 Control Unit
Simple Sliders by Norm
Great BRAUN style. I don't love the halftones. But overall, great!
Dieter Rams by johnelliottco
Clock (Dieter Rams Inspired)
Week 1 - Skeuomorphic Web Design - This is about a real looking UI kit. The switches, knobs, and buttons all look as if this were a real board.
Close-up of dial for unknown Braun product. Design: Dieter Rams