Removing the lens hood will give you more lens flare. Likewise, using UV/clear filters will give you more flare as well. Lower-quality lenses are more prone to flare, so if you want even more flare then you might want to use your worst lens.
That being said, it's all about the angle you shoot from in relation to the sources of light, so try moving yourself and/or the camera/lens until you find the amount/quality of flare that suits your personal taste.
Lens flare seems to have been in vogue on sites like Flickr for a while. While at this point it has become a bit annoying (especially the flare added in post), the right scene with the right flare can be beautiful.