Just off the top of my heid:
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 :/