I just saw this thread. (Seriously, is there a way to subscribe to every new thread and/or page comment?)
I realize it is several months old now, hehe, but I think I know what you're referencing:
Template:Chance Item
If so, I think it looks nice (love the little icons!), but I think it needs a tad bit more clarity. I'm not sure what the best terminology would be, but just looking at a picture of dice with 15% doesn't really tell me what that means. (I try to imagine that I'm using the Wiki as a complete newbie player.)
Maybe you could put that "Initial Chance (No Luck): 15%" and "Every +1 Luck provides a 3% increase to your success chance." Or maybe I'm just oversimplifying it, which I have a tendency to do.
Visually, I think the + should be bigger so that it's a little more in-line with the dice icon. That's my only real suggestion based on the way it is now :)