You can use the same index card technique for practicing arpeggios. You can reuse the bowl with the roots, but start a new pile of cards for all the different arpeggio patterns you learned in this book. If you've learned other arpeggios from other sources, add them to the pot, too. Since the arpeggios are linked to chords, it's a good idea to practice them through some standard progressions. And yes, you can make cards for progressions, too. Use the twelve-bar blues and the I-vi-IV-V progressions, and if you have chord progressions from your songs, go ahead and use them, too. Mix it up and select different things every day. Practicing this way will keep your brain constantly challenged; plus, this is one of the best ways to learn the fingerboard because you're constantly moving shapes around.