Here's a short but quite tricky picking lick in D-dorian/blues. The first part is pretty straight forward but it's the last 7 notes that might be a problem.
The reason for this is that it shifts from being 3-notes-per-string to 2-notes-per-string in the middle of a pretty fast run. Very useful to get down though since it'll open up your possibilities a lot when improvising.
Here's the pdf and guitarpro files. You can find a video demonstration of this lick over at my Instagram.