Have actually tried to daydream about my own ideal X-backed currency. I like the idea of tying a dollar to time, where you have certification standards and the equivalent hour that your unit buys you.
A copper unit is 1 hr of unskilled labor, a silver some flavor of skilled but low-stakes labor, and a gold high-value work that requires expertise. CPA’s would be silver, surgeons gold, and teenage cashiers the copper.