This is the map I entered for the Maplantis Christmas mapping contest. There was no winner, and my entry was pretty much the only serious one. I put a good deal of effort into it, so I dug it up and decided to post it.

http://www.staredit.net/files/714/

The objective is to steal the opposing team's gifts from under their tree. Both teams can make Protoss units. The Maplantis side can get Terran units, and the Evil Elves side Zerg. Building a Pylon yields a time bomb which destroys all blocks vertically and horizontally from its location.

I like, good job, very nice, i think i will play it, oh i will play it, good job
Sounds like you have that very happy Christmas spirit, good job,
I like the zerg blocks detonate bomb, job well done! Do you host this on
b.net? You should because this looks great. I can never finish maps and
I'm very glad to see that you have finished this great looking
Map, And being serious is what this site needs! Good Job!

Thanks. I do host it once in a while, but it's a bit strange if it's in the middle of August. I'm sure I'll be playing it a lot more come winter.

Explain the exploding pylons, and how you "steal" presents.

How many Presents?
Building Units are for...
Buildings that Build Units are...
Detailz Pl0x.

For every player on your team, there is a present under your opponent's tree. You are a probe, and all presents are powerups. You must get every present under your own tree.

There are eight types of gifts, and they must be under your tree to be activated:

"Obviously a CD" - Data Disk, Ability to make Dragoons and Robotics Facilities
"Bling Bling" - Khalis Crystal, Gives you a Templar Archives
"Pointy Present" - Uraj Crystal, Tank / Ultralisk
"Neatly Wrapped Present" - Protoss Gas, Upgrades
"Poorly Wrapped Present" - Zerg Gas, Increased mineral gain
"Christmas Dinner" - Young Chrysalis, Vulture / Hydralisk
"PS 394" - Psi Emitter, Marine / Zergling
"Toy Robot" - Khaydarin Crystal, Support Bay (Reavers)

You can build cannons, gateways, battery shields, and robotics facilities. From gateways, the four Protoss ground units, and Reavers from the Robotics Facility. Both Archons are playable. Each team gets a Dropship / Overlord to use to spawn Marines, Vultures, and Tanks for the Terrans, and Zerglings, Hydralisks, and Ultralisks for the Zerg.

And Pylons, of course, blow up everything to the left and right, and above and below where they were created. This kills all Probes, troops, and buildings in their path.