These days, my fingers have been quite cold. I bought an inexpensive Temperature Biofeedback device.
You take the digital thermometer (looks like a small clock) and it has a a cord. One end of the cord hooks into the thermometer and the other end of the cord has a sensor that you tape to your finger. As you relax, more blood flows to the area and your fingers warm-up. The machine doesn’t do it, you do it!
It is really cool as you watch the temperature rise as your fingers warm-up. And though I have only used it a few times, my fingers seem to stay warm for an extended period of time.
I also think that using imagery can be helpful. Imagine your fingers or toes soaking in warm water or similar imagery.
Check-out the following for more helpful tips:
This information is for educational purposes only!
-Glenn 
