"Blam! Right out of the gate I knew I was looking at a package built by WiX. How? Look at the red. All the other installation vendors out there like blue."
Well, I suppose that's better then the way I used to know that a package was built using WiX. You know..... No Dialogs At All!
Anyways, since Red is somehow better then Blue, I thought I'd mention a feature called Themes that InstallShield introduced back in IS2008. It tries to pretty up the install while still using internal UI capabilities provided by Windows Installer. Naturally, if that's not good enough, they also provide an external UI handler to extend to your hearts desire.
So first is the `Classic` Blue that everyone is so familiar with:
Here are a few of the provided alternatives in case you don't feel like making your own theme: