[mananaysiempre]

> What icons have ever not been skeuomorphic?

The download/,upload ones. For extra points, they're also an English-specific visual pun. I can't think of a language-neutral version, though, unfortunately.

(Was also going to mention play/pause/stop, power, and standby, but you edited those in already. Still throwing this out there in case anyone knows a solution to the download problem.)