Irregular Application Window

How do I create an application with an irregular application window?

For context, I’m creating a launcher using Unity and I would like to add some depth to the launcher, similar to World of Warcraft or Guild Wars 2.

Notice how the World of Warcraft and Blizzard logos extend beyond frame of the window. How do I do that?

I’m not sure that Unity is the most appropriate application to do something like this – perhaps something like WPF?

You’d probably have to create a transparent window background like so: [SOLVED!] Windows: Transparent window with opaque contents (LWA_COLORKEY)?

I’m using the SimplePatchTool (GitHub - yasirkula/UnitySimplePatchTool: Unity port of SimplePatchTool library to add patching support to standalone Unity applications), which uses Unity as its UI.