Well, people are interested in all sort of things, including other people, so as Darren says, think about your life and the things around you.
Do you have any fascinating hobbies, have you travelled anywhere inspirational?
You can write an article about anything under the sun really - gardening, wildlife, travelling, photography, current trends, historical events and people - especially if there's an anniversary coming up - for instance on this day (11th April) in 1973, The British Government introduced a tar content table to be printed on cigarette packets.
Not very interesting, I just used it as an example. But there's plenty to write about, don't worry about thinking to much or planning, just sit down with a subject, start writing and it will flow. And the more you write, the better you will get.
Have fun
Kat x