If it's not too depressing for you, a lot of math majors become actuaries. For abstract pursuits, the only real option is graduate school. As far as teaching goes, it would depend on the college/university as to how much research/publishing time and how much teaching they'd want you to do. Still, there are plenty of jobs in the applied sciences -- physics, engineering, etc. Maybe a job at a think tank would allow for creativity.
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If it's not too depressing for you, a lot of math majors become actuaries. For abstract pursuits, the only real option is graduate school. As far as teaching goes, it would depend on the college/university as to how much research/publishing time and how much teaching they'd want you to do. Still, there are plenty of jobs in the applied sciences -- physics, engineering, etc. Maybe a job at a think tank would allow for creativity.