Here is an etude I wrote and have been practicing lately. It is in B harmonic minor. The first half is good for single string runs, while the second half is some pretty challenging string skipping, all in octaves.
[VIDEO]http://www.youtube.com/watch?v=VHSxaOjO4t0]String Skipping Etude - YouTube[/VIDEO]
Hope you enjoy!!!
Don't take offense, but you really need to work on your timing. You are ever so slightly out of time for the majority of the exercise.