Our themes target the desktop (Silverlight) client not the html client. We may in the future develop some themes for the html client but at the moment we only target the desktop.
Thanks for your support of our themes.
Sorry I didn't reply sooner. You can absolutely use these themes with Silverlight controls. Checkout this post here http://lightswitchhelpwebsite.com/Blog/tabid/61/EntryId/88/The-LightSwitch-JetPack-Theme.aspx where Michael Washington shows the use of the JetPack themes with custom Silverlight controls.
A couple of people have now asked for alternative to PayPal so I am investigating options. Any suggestions?