Site-modding Think-tank.

[Zeldor]

Some small mod with new sites would be cool, if it's balanced it could probably get incorporated into CBM.

I think you should look at site-searching guide and see what terrain types don't have magic sites of certain level and fill that gaps.

[Endovior]

High-level sites that do AWESOME things would be cool.

More critter summoning sites ala Rl'yeh would be awesome.

In particular, powerful sites that mimic the effects of high-end summons would be what I'm looking for... something like the Gates of Tartarus at Death 9, enter to fight the Guards of the Underworld and rescue Tartarians if successful.

Stuff like that.