I know it's subjective, but...

What is the most aesthetically pleasing radius for small wood signs? Here's some background.

I want to make square signs in 3 sizes: 7.25", 9.25", and 11.25". I'm going to make them by cutting pine planks of 1" nominal thickness, which I believe is actually 3/4" thick. I'm going to leave the back side alone, but I think they would look much better if I rounded the front edges. The question is, what radius in general do most people find most pleasing? Of course I can always experiment, but I'd much rather go with the voice of experience.

What radius produces the most "elegant" look? If I had to take a wild guess, I'd say a smaller radius is aesthetically more pleasing than a bigger one.

Any opinions?