Painting gnoblars quickly?

I have a special loathing for painting gnoblars - there are just too many of them and they are too small/fiddly (I chose ogres for a reason).  Is there a quick way to paint them?  Was thinking of just spraying them all green - what do the skaven players do for their slaves (guess they have this problem but even more so)?

For my gnoblars I painted them green all over, then split them onto 4 groups. To give them each 1 of 4 shirt colors. I then took each shirt color and put them into 4 groups and did one of 4 pants colors. I then did all weapon and meat bits brown and washed with a brown wash all over. Done in no time.