I've always found just adding a 7th can spice up any boring arpeggio triad in multiple contexts, whether it be smooth jazz or a heavy metal solo.
The chord progression in this exercise is:
Am7 G7 Fmaj7 Em7
Dm7 Cmaj7 Bdim7 Cmaj7
You'll notice that I'm ascending up all the arpeggios by playing the 1st, 3rd, 5th and 7th then descending diatonically. This can add a cool bounce and also an alternative to just playing the ascended notes backwards.
You'll also bands like In Flames and Testament will use for example a minor 7 arpeggio to ascend in a big shreddy diatonic descend. There's a very good example of this in the solo of an In Flames. Song called "December Flower."
Once you get your head around these try incorporate them into your improvised and written solos.
Have fun with it guys!