Etude No. 1 by Heitor Villa-Lobos has a great arpeggio pattern:
This is a good arpeggio to practice because it uses the a finger, which as I mentioned earlier, really dictates how your overall technique is. You can play this arpeggio pattern with whatever chord you want or can even just use open strings.
The goal is speed (quarter note = 126) and clarity.
This etude has a complex pattern and it is best to break it up into small segments. Practice the segments separately and then combine them. Here is an example of how I would break it up:
Each segment is five notes and overlaps with the next segment. The more complex the music the smaller the segments. I would practice each segment individually and at different speeds. Including very slowly (sixteenth note = 72). Then I would combine them like this:
A/B, B/C, C/D. Again at different speeds.
Then I would make the segments larger by playing A, B, and C; B, C, and D and then finally I would play the entire measure. I use this technique a lot whenever I am having technical difficulties with a piece.
Here is another arpeggio pattern I like to practice:
Like the Villa-Lobos example, I would break it up into smaller, overlapping segments.
Here is an arpeggio pattern that shifts:
This exercise works on shifting between positions with the left hand as well as gives the right hand an arpeggio pattern. I will practice it with both: p, i, m as well as i, m, a. Here is the descending version: