Good one from back in the day (not mine): "In a world without walls and fences, who needs Windows and Gates?"

"For slogan, please refer to the according man page"

more seriously maybe "Software it your own way"

Linux. The Power of the Community. I didn't come up with it and the picture is not mine. I just found it on the internet earlier.

"Your Computer".

Yours to make, yours to break.

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"I didn't want to play that game anyway."

It is in fact GNU/Linux.

"It's terminal"

It's a headache but it's your headache.

Its not windows

Join a Movement, not a Marketplace

Hurts So Good

Free as in beer

Two out of 10 Linux users agree that insert name here is the best distro

"It does exactly what you tell it to do."

"Own your computer" and "Free your computer"

"We hope you like config files"

The least annoying launcher for your web browser

With a bit of a double-entendre, "It powers the world", since it's the most common server platform.

More funny: "It's not an OS. It's a hobby."

"It just works"

..because that is the state of a mainstream modern distro, and it's not true of Windows anymore.

Alternatively "No nagging, no forced online account."

Own your Computer

Have it your* way.

*your way may involve several hours of configuration

Batman runs Linux. Shouldn't you?

Live, Laugh, Linux

Buy it, own it.

Sovereign Computing

It’s yours.

“If you knew what it was, you’d be using it already.”

I'd just like to interject for a moment. What you're refering to as Linux, is in fact, GNU/Linux, or as I've recently taken to calling it, GNU plus Linux. Linux is not an operating system unto itself, but rather another free component of a fully functioning GNU system made useful by the GNU corelibs, shell utilities and vital system components comprising a full OS as defined by POSIX.

Many computer users run a modified version of the GNU system every day, without realizing it. Through a peculiar turn of events, the version of GNU which is widely used today is often called Linux, and many of its users are not aware that it is basically the GNU system, developed by the GNU Project.

There really is a Linux, and these people are using it, but it is just a part of the system they use. Linux is the kernel: the program in the system that allocates the machine's resources to the other programs that you run. The kernel is an essential part of an operating system, but useless by itself; it can only function in the context of a complete operating system. Linux is normally used in combination with the GNU operating system: the whole system is basically GNU with Linux added, or GNU/Linux. All the so-called Linux distributions are really distributions of GNU/Linux!

Do it yourself

Wobbly Windows in a Windows-less World

Think ~~Different~~ Freely.