Good photography ideas?

So i just got a nikon camera and 2 lenses but i really can't think of anything to take pics of. I do it because i upload them to instagram and tumblr. But anyways any SIMPLE ideas?

Plants and nature. Or even peopl. I used to take pictures of my friend and pictures of flowers too. Flowers and nature are really easy

Go out at night if you can, set your camera to M / manual or S / Shutter priority mode and lower the shutter speed to 6 seconds (you need a tripod). Go to a busy street with cars and press that shutter button and see the magic happen. Example