Plastic and chrome button ui inspirations
20 Brilliant Examples of Skeuomorphic UI Design
launch-start-button-2.png by Dave Johannes
Olivetti Divisumma 28 calcolatrice da tavolo Mario Bellini 1973
Power Buttons Freebie UI. Some pixel-perfect power buttons for your next design by by Michael Donovan.
denon envaya bluetooth speaker by feiz design studio enables music sharing
power socket designs by Gijs de Zwart, via Behance