I second that. There are 6 basic arpeggio shapes that you need to learn. Of course there are other more exotic shapes but those 6 cover major and minor (3 for minor and 3 for major). Sure you can work on chromatic exercises but if you stick to that then you really won't learn anything except how to use your right hand. It's difficult enought getting the left and right together, the most difficult part is linking shapes and of course changing from up to downward stroke (hammer and pull or pick and pull). Might as well go for it and practice the shapes from day one. Chromatic runs work but they are generally done using a conventional shape. If you want to master sweeping patterns then its like anything else, the shortest distance between two points is a straight line.