Reader Nathan Smith offered a clever way to include colors in the actual file names of your Projects, Albums, etc. in Aperture. This applies to any version, however in Aperture 3.3 where colors have been removed from the interface, this may be more relevant than ever. His video is embedded below.
Under Mac OS X Lion (it’s a Lion feature only), you can access the same emoji characters that you can in iOS. This is probably largely due to the upcoming ability to send messages between iMessage on an iDevice and the Mac, and so you need those funny characters actually showing up if someone reads their iMessage on a Mac! To access them, just open the Character Palette (usually but not always found under the Edit menu, and called Special Characters), and select Emoji. The Symbols subset is where you’ll find the most basic ones, although you can always add 😄 or 🐵 or 🎅 or 💩 if you really want to.
Oddly, there seems to be a change in the OS since Nathan recorded this video. Now the only easy to find big color circle is the red one 🔴 , however if you search for “circle” you can also find a blue one 🔵 — and you can add these to your Favorites to make them easier to find later. The purple and green ones are gone (from OS X and from iOS). Maybe they’ll return one day?
Here’s Nathan’s video.