Here's a pair of convertible mittens, my own pattern, with texting thumbs. This is Wool of the Andes 100% Peruvian Highland wool in a blackberry (deep purple) color. My son grabbed them and put them into use before I could get a good picture. Here they are, well loved and complete with dog hair.
What wonderful mittens! And obviously already much loved!
Great idea about the convertible thumb piece for texting. When all those scientists of long ago (like when I was in high school) insisted humans would lose their thumbs one day from disuse, they never dreamed we'd "start" using them again with future gadgets!! (Personally, though, I never stopped using mine even without texting!)