Scroll down the menu bar to find... a poll! Use it to vote for the topic of the next contest. I'll explain the short topic descriptions in more detail here:
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Scenery: A map focussing on scenery. The HL engine isn't really suited to outdoors stuff, but that makes this all the more interesting.
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Unused models: Peruse the HL PAK file, and you'll find several models that were never used in the game. Find an inventive use for one or more of them. The fact that most of them don't do anything makes this a challenge
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Explosion sequence: ...or destruction sequence, rocket lift-off etc. Put the sprites, sounds and lights to good use and this could be very exciting.
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Specific entity: Get given a specific entity to work with... OR... focus a map on one entity. Fairly open-ended, this.
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Movie-based map: Take an idea or theme, or an object, or whatever, from a movie, and build a map around it.
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Something else: If none of the topics blows you away, and 'something else' becomes the overwhelming vote-taker, we'll be forced to think up more topics.
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Thanks to everyone who submitted contest ideas - these are all them! BTW, you can only vote once every 6 hours :).
More site news: I'm redesigning the forums. Yay! Expect them to be a hell of a lot faster and easier to use than the existing ones.
Check out my thread, where you can post any ideas you have for the new system.