Discovered this by accident while debugging a design - an odd oscillator configuration.
Not self-starting, but once started will continue oscillating indefinitely. Seems to need a fairly high gain transistor, and is somewhat dependent on coil and transistor type.
Possibly not very useful due to dependence on component characteristics....
It oscillates with R1 from 1 to 5K, and on supplies of 2.5v upwards.
Coil used - 100uH power inductor.