I have +24 and need +-15 at a couple hundred mA. My regulation requirements aren't extreme (I'll be powering opamps in my capacitance/fuel level simulator) and the load will be pretty well balanced.
This might work:
I haven't seen this particular topology before, but it's unlikely to be original.
For better efficiency and cross-regulation, which I don't need now, D1 could be a p-fet synchronous rectifier.
The cute little TPS54302 soft-starts and current-limits, so the initial surge into C1 should be OK.
This might do goofy things at low loads... gotta Spice it. I don't have an LT Spice model for TPS54302, but something else will do for the sim. Maybe just a voltage source, or some similar LTC part.