Bow - replaces sniper rifle FP
scythe - replaces flamethrower FP
knife (straight blade) - replaces pistol fp
knife -
http://forums.halomods.com/viewtopic.php?t=72753
I was too lazy to get rid of the flame on the scythe for the pic..

Also, the knives both look better if you import the animation file included. (Thanks to corvette19 and [ZMT]1337)
To import the animations: Open map in HHT, go to [antr] select pistol_fp, and in the bottom left corner click the box that says 'Inject Meta', browse to the anim file and click it. Wait for it to load for a few seconds, then a pop up will say it's done.