With ad networks I have the most success with
Exoclick
With just 1 spot on my gallery and 1 in footer I make $25-30 a day which maybe doesnt sound like much but in a month that adds up. This comes as a bonus in addition to my regular paysite sales.
I also have a couple banner spots up for paysites, that affiliate reps update for me, but they don't pull in much money. So I guess I should change them out with pay per click spots, just need to find a fitting ad network for it. (Don't want to show duplicate banners)