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You basically have 3 options.
1) Recover more heat from the engine.
2) Retain more heat from the engine.
3) Add external heat from another source.
#1 isn't very common as far as DIY mods go. But you can use exhaust heat to warm up your coolant faster. This could be an inline heat exchanger, additional EGR cooler type setup, or brazing/welding tubing to your exhaust manifold and running coolant through it.
#2 means insulation basically. Grill block, block insulation, coolant thermos. They all fall into this category of not letting as much heat be lost to the atmosphere.
#3 we're all quite familiar with due to block heaters which are a fairly easy item to add.
Hopefully that helps some creative juices flowing.
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