Open C Tuning (CGCGCE) is one of the most frequently used alternate guitar tunings. It is used by many great bands, like Led Zeppelin and Soundgarden. The C-major chord sounds very rich and powerful in this tuning (try it: strike all the strings without any fretting). Here is an example, played with a guitar slide:
Guitar tab for this guitar riff is:
(Remember to tune your guitar in Open C Tuning.)
Corresponding MIDI drums bar is:
If you want to learn more about MIDI drum pattern making, then read this article: How to Create MIDI Drum Pattern for your Riff.
You can: Download MIDI drums for Open C Riff here.