jTable has it's own themes. It also supports jQueryUI's theme system.
jTable can use your jQueryUI theme. You can create and download your jQueryUI theme from http://jqueryui.com/themeroller/. So, limitless themes can be built for jTable easily. Here, there are some example jQueryUI themes. Click images to see running demos.
Here, all themes and colors those are built-in jTable. Click images to see running demos and needed information to use the theme.