As a general rule, your exact undergrad major is less important than having strong letters of recommendation, high GRE scores, a high GPA, etc. Of course, an admissions committee will want to see that you've taken some relevant coursework and that you've done well in it. See the web site for the programs to which you intend to apply: most will spell out both the minimum preparation they expect and additional coursework they would like to see. (For example, an economics program might require that you have taken intermediate level micro and macro, calculus, and statistics.) If you are a strong candidate in other respects, you may even be able to make an argument for admission despite some missing prerequisites.
I'd suggest that you might want to focus on what you hope to do with a graduate degree and then work backward to which degree to pursue, rather than casting about for a degree to pursue. Unless the subject is wildly-unrelated to your course of study so far, you can probably add coursework to make yourself a good candidate for the degree you need.