4. Sell Stock Photos
If traveling or photography is your hobby, do it for a purpose (I mean for cash). While on your journey to tourist points, natural beautiful places or cultural heritage, take some good pictures there (not yours but also of the place) or if you are a skilled photographer and able to take really good pictures of ordinary daily used items (clock, phone, books, flower vas, currency notes etc), upload it to Stock photo site such as iStockPhoto, Fotolia and Shutterstock for sale. People often search these sites for specific keyword related pictures to publish on their blogs and if you had done really good work, your photo may be picked by them and you’ll get paid in return.
Remember one or two pictures are not sufficient but having a good number of photos being uploaded to the above mentioned sites will give you a nice monthly income.