IM Chat Interface Designs for OSX Applications

"Interface design" should encompass more than just visual aesthetics. These are largely concepts focused on making something that looks good, not concepts that break away from an IM client convention to actually improve usability.

It's useful to see these as launchboards for a visual aesthetic, but it'd be really cool if showcase posts like these (or designers on dribbble) talked about the pros and cons of different design decisions they made, why they chose to style an interface element differently, why a particular design is an improvement over what exists…

This is, sadly, pretty rare.