I am so, so, so proud of myself!! I finally figured out how to modify .png files! So, I made up several mods of my own.
First, I made up a mod for the Villager Detail page, that puts lines across each of the skills to show how close they are to reaching their next skill level. This was done in an earlier game, and I thought it was brilliant...so since no one had done it for this game yet, I did it. Here's how it looks: