This might seem obvious or dumb, depending on your sensibilities, but the new Messages app makes a decent universal clipboard.
- Copy a link, photo or text and paste into iMessage on Mac, iPhone or iPad.1
- Send a message to myself.
Yeah, it's a little kludgy and ugly but it works. Since when is a clipboard pretty?
Sending a file from the Mac version works too. On iOS I get an option to "Open In..." another app. Unfortunately I do not see a way to send a file from iOS. ↩