Hey Ebenfrank,
I may have something for you, and you can even work on your strumming techniques. These are short runs in between chords, and several boom chick patterns used for bluegrass. You mentioned Earl Scruggs, so I hope this is what you're looking for.

http://www.guitartricks.com/tutorial.php?input=832
http://www.guitartricks.com/tutorial.php?input=846
http://www.guitartricks.com/tutorial.php?input=869
http://www.guitartricks.com/tutorial.php?input=910
http://www.guitartricks.com/tutorial.php?input=917
http://www.guitartricks.com/tutorial.php?input=965

Every other one is with fills, or go through all of them if you want to work on your strumming. I hope this helps, and let me know your progress.