Thanks everyone! I made up the pattern (you should see my notepad, it's a mess of scribbles... I kept forgetting to write down the color changes), but it's pretty easy. Hold on - let me draw a quick sketch.
1. Start with a base chain that = the length of glove you'd like to have.
2. Work any stitch you like along that chain.
3. Continue to work your stitch for as many rows as it takes to wrap around your wrist. You should have a longish rectangle.
4. When you've made the rectangle, cut a long tail (about twice the length of your rectangle) and pull it through your loop.
6. Thread a needle with your tail.
5. Fold your rectangle in half (lengthwise) and begin to sew along the new seam.
6. Close to one end, you will need to skip about 1" of stitches to make room for your thumbhole.
7. Continue to sew up your seam.
8. When you reach the end, make a secure reinforced stitch and weave in your end.
OPTIONAL: Add rows of additional stitches on the top & bottom of the tube for a more finished look. Play with color change within your rectangle to make stripes or other patterns.
RUBY MITT NOTES: I used hdc because it's a shorter, bulkier stitch. Keep in mind what type of yarn you're using and what kind of stretch the fiber has. Be careful to get a comfortable fit. My first pair were too loose and my second were too tight. The third pair were just right. I also make extra reinforcing stitches just before & after the thumbhole.