Of the two kinds of meditation, focused attention and open monitoring, mindfulness meditation is normally focused attention and usually focus on the breath.
The other kind of meditation, open monitoring takes a bit of getting used to if you have only ever done focused attention. Here is a simple open monitoring meditation called the mirror meditation.
Sit comfortably with your back straight and focus on the breath for a while to help still the mind.
Once you are calm open your eyes and look down at the floor in front of you.
Allow yourself to be as aware as possible of whatever you can see from the very corners of your eyes.
Don’t return to the breath but allow yourself to take in what you can see with your peripheral vision.
This may feel a bit strange for a while but it adds some variety to your practice and exercises your awareness and your mind.
That’s it, the mirror meditation.