1- Interviews should be about a page long. Consider yourself a newspaper reporter who's obliged to get an interesting story. For student interviews consider finding out why they're going to college, what their career will be and how they decided on it. Consider finding interesting hobbies, high school experiences or work experiences.
2- Getting interesting material is partly luck, but you can stack the deck in your favor. Choose interesting people. Ask questions that engage or provoke the interviewee. Pay attention to the interviewee's feelings. These can lead in interesting directions. Look upon people as nuts; some have no shell at all, others have thick shells which require skill and patience to crack.
3- Express your information creatively. Instead of saying, Joe Dimwit works 20 hours a week. He's having difficulty keeping up with assignments, say As much as I liked Joe Dimwit, he is making a serious mistake. For just a few dollars, he's sacrificing his college career to a menial job.
4- Make sure your interview doesn't read like a list.
5- If your interview was fun to do and write, it's probably fun to read. If it was tedious to do and write it's probably tedious reading. Find a way to make it fun. A skilled interviewer can find the excitement in an apparently dull person. A hack can make the world's most interesting person sound dull.
6- If your interview really is dull there's no reason you can't do a second one. If you do 5 or 6 and find they're all dull it's time to assess your interviewing skills.
7- Say things concisely. Excess verbiage reduces impact.
8- Don't be afraid to let your roommate read and criticize your interview.
9- Good writing takes commitment. Keep trying! Improved writing impresses me as much as innately good writing