Here are some maps I made a while ago and never bothered finishing/releasing.
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Blobs01:
One of the first few maps i made. It has lots of hills and small roundish islands.

Pics:
http://i.imgur.com/KAfmo.png
http://i.imgur.com/mG5MF.png

Download:
http://filesmelt.com/dl/blobs01.vxl
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Desert01:
Pretty self explanitory just a hilly desert.

Pics:
http://i.imgur.com/ib0Rz.png
http://i.imgur.com/0lB0K.png

Download:
http://filesmelt.com/dl/desert01.vxl
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Hallwayx2:
Something like the regular hallway map but it has 2 hallways which cross eachother in the middle of the map.

Pics:
http://i.imgur.com/lHBln.png
http://i.imgur.com/JDzK7.png

Download:
http://filesmelt.com/dl/hallwayx2.vxl
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koth:
A map with 2 round platforms for each team and a large tower in the middle with a moat around it.

Pics:
http://i.imgur.com/RvWQp.png
http://i.imgur.com/7gYh8.png

Download:
http://filesmelt.com/dl/koth.vxl
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Midground:
A map with 2 large land masses for each team and a river with a large island in the middle.

Pics:
http://i.imgur.com/wwVPp.png
http://i.imgur.com/vuEhf.png

Download:
http://filesmelt.com/dl/midground.vxl
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River:
Was a test for sculpting terrain in blender then rendering it as a heightmap.

Pics:
http://i.imgur.com/fWScZ.png
http://i.imgur.com/dSRBu.png

Download:
http://filesmelt.com/dl/river.vxl
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Twist:
A result of messing around with GIMP.

Pics:
http://i.imgur.com/NFXwt.png
http://i.imgur.com/ZoVrc.png

Download:
http://filesmelt.com/dl/twist.vxl
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Voronoi01:
An old map with lots of pointy islands made using the voronoi diagram generator in Blender

Pics:
http://i.imgur.com/KsFcZ.png
http://i.imgur.com/r5qC9.png

Download:
http://filesmelt.com/dl/voronoi01.vxl
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All of these were made using bildramer's bitmap converter and GIMP.
Go ahead and edit these maps to your liking as long as I get credit if you release it.

Also here are my other maps:
4rivers: http://ace-spades.com/forums/topic.php?id=1806
Grid: http://ace-spades.com/forums/topic.php?id=2065
Epic Landscape: http://ace-spades.com/forums/topic.php?id=3070

even if some aren't finished, they all look very playable. I would love to play on any one of these.

Four rivers was a very cool map, and all your "natural" maps look like they'd be cool too. (Twist looks pretty but I wouldn't want to play it)

I'll host one of these if you tell me which one you think would be the most fun!

Those are actually very impressive.

Twist looks amazing, we need to host a server with that.

Host Twist.

OK I'm hosting Twist as Twist Map by Flyguy! I'm using the vanilla server tho, so dealwithit.jpg

EDIT: ok I took it down, it looked cool but wasn't practical

whoa, lots of maps

got to try only koth so far but i like it, wish there was more height space on top of the middle platform though