Here are the entries for Deadcember 2017 (with prizes from Ral Partha Europe - thanks fellas!). You can also see discussion and works in progress over at this thread on the Oldhammer Forum.
1) Iain Harrison
A Nick Lund sculpt for Grenadier.
2) Gareth Shaw
A 1982 Necromancer with skull by Ral Partha.
3) Stuart Bannister
A converted GW Plague Cart that's gone all ghostly.
4) Iain Harrison
Another Grenadier "wet-skeleton"
5) Chris Kellahan
Liche queen on zombie unicorn (Bears Head Miniatures)
6) Roger Duthie
Undead champion (Northstar)
7) Jani Kortesluoma
A dead elf! Because the only good elf is...
8) Thomas Zero Twentythree
Salvaged 1st generation plastic cavalry
9) Thomas Zero Twentythree
Celtos mounted wraith
10) Thomas Zero Twentythree
2nd generation Citadel plastic skeletons
11) Thomas Zero Twentythree
old Citadel LotR barrow wight and newer Reaper "Bones" character
12) Matt Shearn
The Grenadier undead mammoth - what a monster!
13) Ana Polanscak
A lich converted from an undead lord by Ral Partha.
14) Claudio Caceres
Good ol' Citadel plastic skellies
15) John Robin
16) Alex Howarth
All the undeads. All of them! I don't quite know if this counts as an entry as per the challenge outline, but there was no way I could not include this massive contribution to the deadcember theme!
17) Chris Kellahan
I'm starting to think that he, Zero Twentythree, and Alex are actually necromancers themselves, the number of undead they are
18) Twisted Moon
Because Deadcember would be incomplete without TWO undead mammoths!
19) Iain Harrison
Leesh/litch/leetch? Who cares when they look like this!
20) Michael Dunnage
As he puts it, "not old, but definitely dead!"
You can see all the close-ups at his blog, riotville, but this one is my pick of them:
21) Germinal Solé
The gloriously oldhammer C18 Death Spirit from the Night Horrors range
22) Thomas Zero Twentythree
He's back again! This time with Maurice Dellamorte and his undead commandoes...
23) Thomas Zero Twentythree
...and an undead owlbear! That would really freak out my D&D group!
24) Andrew Dyer
A screaming skull catapult and crew
25) Steven Rowlinson
"Hero Quest Chaos sorcerer reborn as 'Lord Skelephor the Necromancer', plus his minions including an undead giant from the Darkworld board game."
26) Ivan Prentice
"An old broken Citadel C17 Skeleton resurrected, with the aid of modern GW plastic parts."
27) Geoff Solomon-Sims
Terror of the Lichemaster figures 1 - dwarf ex-miners
28) Geoff Solomon-Sims
Terror of the Lichemaster figures 2 - dwarf ex-miners
29) Geoff Solomon-Sims
Terror of the Lichemaster figures 1 - ex-villagers
That's all folks! Thanks to all contributors. Winner to be announced soonish...