Change jQuery icon color to white instead of gray

you can play around with the sprite used on that icon set:

White Icon Set (ui-icons_ffffff_256x240.png)

Store that sprite somewhere, then reference it in a style sheet you can apply to the blue buttons:

.ui-icon-white {
  background-image: url("images/ui-icons_ffffff_256x240.png");
}

Then when you want a white icon set, apply that style:

<span class="ui-icon ui-icon-white ui-icon-pencil"></span>