Sooner or later, I will build five temples, four small ones around a huge central one. This is an explanation of what they will be like:
Water Temple: A small, 24x24 building with an 8x8 pool of water in the centre. A temple to the God of Water.
Fire Temple: Another 24x24 building with an 8x8 pool of magma instead of water. A temple to the God of Fire.
Air Temple: Yet another 24x24 building, same size pit, but about 10 z-levels deep, with crossbow traps everywhere in the hole. The bolts are to simulate forces of wind throwing debris all over the place. A temple to the God of Air.
Earth Temple: Same as all other temples, same size, same pit, but a down stair in front of the pit, which is covered with a clay floor and a single support under it. A lever connects to the support with a caged sacrifice under the floor. A temple to the God of Earth.
Blood Temple: Ah, yes. A huge 40x40 building, with a 16x16, 10 z-level-deep pit in the middle, with activated upright spikes at the bottom. An altar of five crude sacrificial devices, to dispose of captured enemies and annoying nobles, will look like this:
|-|-|-|-|-|
|R|R|R|R|R|
|S|S|S|S|S|
- and |: wall.
R: restraint.
S: upright spike trap (activated when sacrifice stands on it)
I'm not so sure if one can safely uncage an invader and assign it to a rope or chain, but let's assume these killing devices can work for now. This temple will be dedicated to the All Mighty Armok, God of Blood.
The altar will face north and should be straight when building Armok's temple, and the temple should be at least 3 or four levels high and have crystal glass windows dotted every four tiles with gem windows in between those, with C for crystal glass windows, and G for gem ones in this diagram:
-C-G-C-G-C-G-C-G-C-G...
And so on until the temple is complete. Green glass should be placed in the same intervals as crystal glass windows in the Earth God's temple. Install clear glass windows the same way with all other temples.
Of course, you monotheists could build just one of the temples in the EXACT same way I described them, with the doors facing south.
For polytheists, have Armok's altars face north, doors to His temple facing south, with all the other temples' doors facing AWAY from Armok's temple.