Travel.
I find myself to be quite good at taking long exposures when I am out and about. For the longest time I would find a flat surface anywhere and get the angle by placing whatever I have in my bag/pocket, be it the lens cap, wallet, folded up bits of paper.
To take it 1 step up, I use these but the purpose of them is being small, and short. Because if the legs extends too much, then I can't place it on some of the surfaces I find, like top of a bin or the corner post on a barrier.
I also have one of these (They are like £20 in HK). The phone holder clamp detaches from the legs and it is a 1/8 inch screw that can go at the bottom of the camera with a small ball joint.
Buy the Joby GripTight ONE Micro Stand Black for Smartphones at
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www.parkcameras.com