Look into programming Windows's GDI. It's what Windows uses to draw stuff on screen, and what Solaris exploits. (IIRC Solaris is a C# malware, but you can do it in C++ as well)

Triggering last BSOD is as simple as calling NtRaiseHardError (NTInternals has this documented).

The final MBR part is rather difficult, since you can't actually stuff all of it in boot sector (512 B), you have to essentially write your own OS and have the custom MBR points to it. (Solaris's last part is done with C)