The Phantom Menace Skin pack
This file gives you skins such as Darth Maul, Obi-Wan Kenobi, C3PO, Qui-Gon, etc.
Mandalor Armor for Single Player. This patch is one of my personal favorites. It gives you modified weapons, a jetpack, a wrist laser, a grappling hook, and more!
Bryar Grapple is a patch that lets you fire a grappling hook out of the Bryar pistol.
Super Weapons is a few cog files that edit Jedi Knight. Let me know how it works, I haven't tried it yet.
Read the readme files after download for more information on these patches.
If you find any patches that are exceptionally good, email it to me and I can put it here too (files under 1MB only). Please only COG or GOB files. I would rather not have 20 files to manually distribute through Jedi Knight when I can use Jedi Knight Patch Commander (by Michael B. Klien). Do a search for and download this great program; it helps!