Upside-Down Cake

Each competitor builds a structure that's playable when flipped upside down. E.g. A room full of pipes and crates where you first navigate across the floor, then end up having to navigate the ceiling. Of course, one might end up walking on the walls as well...

(Spawned from an idea I had for a late SM47 entry, but gave up as it was taking too long. C/f the centerpiece of Marcus Klar's The Fly for the inspiration.) 

The Quake Blade ( SP )

the map must be based, in some way, on the Quake logo itself. It can take the form of a brush-built decorative feature, the floorplan of an area of the map, a funky doorway or some other ingenius incorporation of the 'nail through crescent' symbol. Textures using the Quake symbol are allowed but are not in themselves sufficient to qualify: the symbol must be created architecturally.
Examples are: the shadow clue in e1m5 - Gloom Keep http://www.signsofkoth.co.uk/stuff/ss-e1m5.jpg the arcane lightning conductor at the end of one of hip3m1 - Tur Torment in Scourge Of Armagon http://www.signsofkoth.co.uk/stuff/ss-hip3m1.jpg
the floor of the RL pit in q3tourney2 ( yeah, I know it's Q3A; it's just an example ) http://www.signsofkoth.co.uk/stuff/ss-q3tourney2.jpg

May have already been done, I don't know :/

My 2/- 

Dead Simple

How about a variation on the classic Doom map. Not a blatant copy, but maps following in the idea. 

Alice!

Speedmaps following an "Alice" theme, as per that little Q1SP map, Stamppot. [i think i got the name right] 

Chthon/Shub Theme
All maps must contain at least one chthon or shub

sm50: the next chainmap!
Speaks for itself i think, and would round off the first 50 speedmapping sessions nicely (though timeconsuming)

I can't fuckin move
Entire map must fit inside a 1024x1024 box, (or whatever size is chosen) meaning that gameplay will have to be more innovative (or more shit) and the map will be more detailed.

New pants please
The speedmaps should put a focus on pure scariness... the more it makes you jump, the better! Plus, 'moody' lighting covers shoddy architecture pretty well!

I'll get my boat
You guessed it, im thinking of maps that contain a boat-ride.... through a submerged temple perhaps, or on a modern hovercraft around a swampy base 

 

Another chainmap sounds quite appealing 

I like the idea of just having the mapper involve water in the gameplay somehow. Not as restrictive or time consuming. Some of the others sound good (primarily the Quake blade and having the map fit in a 1024x1024 box, IMHO). Some also sound they'd be way too complicated.