Unlike Architecture, the Discipline of Thought lets you pass the principles of all its tests by simply solving a variety of player made puzzles. To actually pass the tests requires you to build them yourself though AND to have people solve them and rate it as good, which as I mentioned before is a tough balance between not being too easy or too difficult.
Two of the simplest ones for me are the Test of the Pathmaker, which is basically a connect the dots puzzle with a few added rules of blue dots must have a straight line and red dots must be corners with straight lines directly after on each end, and the Test of the Constellation which involves covering up green stars on a "night sky" table.
Easy versions of Pathmaker and Constellation.
Test of the Hexaglyphs can be a fair bit harder. In it, you must arrange a blackboard of hexagons so that the symbols on all sides match the symbols on the glyphs next to them. While the white bordered glyphs are fixed in position, all the others can be dragged around and rotated as you like.
A very challenging Hexaglyph board.
The Test of Venery is the most fun for me, as it is basically like a player-made "treasure hunt". It could be simple and quick or extremely tricky (one I've seen is all maths with the very first clue asking for prime number coordinates >.<) or far reaching - going all across Egypt! I think I'd really enjoy making one of these. :)
Venery sample from Top's Treasure!