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I have taken to paining some of my 'rank and file' type Zeds in 3's for a couple of reasons. Firstly is that when playing Pulp City (see the Pulp Citizen blog here), Zombies are fielded in groups of 3 models, so this gives me options there. Secondly, but it probably helped speed up the painting process a little with only a limited palette in use.
These three minis are all Studio Miniatures (if memory serves me!). I love the characterful touches on the Zed in the dressing gown/bathrobe* (* delete according to personal brand of English!), with the bunny slippers and broken mug still being clutched. Bases are by Fenris Games. I have a lot more Studio Miniatures walking dead to paint, so stay tuned.