What I like to do is mod the minor pentatonic slightly and bring in some "off" tones - for example, using the A min Pentatonic as an example (I've put the "off notes" in parenthesis - they always work well for me as passing tones


[FONT=Courier New]
E------------------------------5-(7)-8----------------------
B----------------------5-(7)-8----------------------------
G--------------(4)-5-7---------------------------------
D----------5-7-------------------------------------
A------5-7-------------------------------------
E--5-8------------------------------------------[/FONT]