I love this plugin! I have one small suggestion, if you're interested. I don't know if you've considered this already, but I wanted to change the border of my fields to a different color if they didn't validate correctly. All I did was add the following line to scripts.js at line 130:
into.addClass('missing-required');
So it looks like this now:
var into = $(this);
into.addClass('missing-required');
into.append('<span class="wpcf7-not-valid-tip">' + message + '</span>');
And then I just added some simple CSS like this to my theme's stylesheet:
span.missing-required input, span.missing-required textarea{
border: 1px solid red !important;
}
It's a small usability improvement, but I think it helps.
Dalton