Life hacks to keep fingers warm at desk job?

Aside for clutching a hot cup of tea or coffee, how do you keep your fingers warm while working on a computer all day? Mine get so cold, it literally distracts me from my work and I find typing in gloves uncomfortable. Here are a couple things I've come up with: 1. My friend just told me that heated computer mice exist and I'm going to put one on my holiday wishlist. 2. When working from home, I keep a lit candle on my desk and occasionally hold my fingers over the flame.