Arpeggios are actually really easy when learn where and how to play them. First of all, they are the 1st, 3rd, and 5th notes ONLY of any scale in any key. So, if the A natural minor scale is ABCDEFGA, the arpeggio is ACE. This may have not been the answer you are looking for, but you can "create" your own arpeggios and use them as you like, whether it be sweep picking, triads, or practicing a certain technique.