I know people out there, not everyone can afford a Mac. Though Apple has cut down price so much since past years, but it's still not affordable to many. OSX might be the best operating system in the world, but not everyone could try it because it comes bundled with Apple-only hardware (unless and until you make a hackintosh yourself).
I've switched to MacBook Pro and Ubuntu this year and I realised both being made on Unix platform share many things that are the same. I also feel if one could not afford a Mac, he must switch to Ubuntu and moreover, it's free. Here are some similarities to highlight:
#1 The Desktop
Ubuntu desktop looks as clean and as minimalistic as the Mac's. The look, the feel is almost identical. The difference is only with dock. While Mac has an horizontal dock, Ubuntu features a vertical one.
#2 System Settings
It seems Ubuntu has completely copy pasted Mac's System Preference to its System Settings.
#3 AppStore and Ubuntu Software Center
Again, the layout, the style, everything's same. Only the apps are different.
#4 The LaunchPad and DashHome
Again copy paste of Mac's LaunchPad. The only difference is that LaunchPad shows only list of apps installed on the system, while DashHome shows both apps and files.
#5 The Trash
Ubuntu guys no doubt didn't leave any chance to copy Mac. Even the trash features the same look.
If you switch to Ubuntu, don't miss the these awesome 20 apps to install.