Not to be unoriginal, but take a cue from the Left 4 Dead video game series also that has combined a lot of undead elements into a whole variety of zombies. My favorite zombies are the speedy ones like in 28 Days Later, as mentioned previously. I dunno why but after I watched that movie it became my most favorite zombie and apocalyptic movie ever. But, I forget when that movie came out.
Summer of 2003 in the States at least (released before that in the UK of course). I'll never forget that because of a particular strange hot redhead I was....hanging out with...who, as I was 29 and she 36, was the oldest woman and widest spread of age older than I that I'd ever....hung out with. A day or three after we went to see 28 Days Later was when she started showing up at my house unannounced. All. The. Time. Hot. Brings me beer. Very....nice when...hanging out. But, ya know...go home sometimes. Hang with your own friends. There. Now ya know more than ya cared to and I got to vent after years an' years.
So, yeah. Women. I mean zombies.
I was actually really pleasantly surprised by how well the sequel 28 Weeks Later turned out. Good movie.
"Hold off thy hands, or by Heaven I'll make a ghost of him that lets me!" - Hamlet