Try shooting with your main camera lens reversed, so that the back element is facing your subject. You can do this with two hands but they also make special reversal rings for this purpose. Looking on ebay you can get them cheap, under $10. Most of my macros were taken with reversed 35mm and 50mm lenses. The less focal length, the higher the magnification. If you don't have one already, look into getting a 50mm f1.8 lens. They are very affordable, can make decent reversed macro lenses, and on the DX format are good portrait lenses as well.