Not really a suggestion for a new set but for weapon sets. I always run out of weapons for conversions etc and there are a few weapons that are rare, like Falchions, Plancon´s/Goedendags, mauls, decent sized (Length) jousting lances (also used in battle)
It could be sets of say 20 weapons a set,
Axes and Falchions
Swords, daggers, sheathed and unsheathed (even exotic swords like flamberge)
Maces, mauls, war hammers.
Plancon´s , Goedendags, Pole flails
Halberds of different types (voulge´s, lucerne hammers, Glaives)
Crossbows
Also sets of shields and helmets of different types.

Ok...I´ll find some soon

Mostly the swords so far produced would be fine for a set
Exotic ones;
Flamberge (flamed blade) They come as single and double handed versions..so the actual length would vary

mauls..basically a hammer. The archers carried lead mauls at Agincourt, knights later on..around 1400

maces

War hammers..the ones with a defined spike on the back are called Beck de corbin..ravens beak.
These also come as pole arm versions..about 1.50meters long

Geodendags. basically a metal weight on a pole about 1m - 1.50m long..with a sharp point so it could be used for stabbing as well as clubbing

A plancon is similar to a goedendag except it has spikes on the sides (sometimes called a "holy water sprinkler")

Pole flails..like the hussites and virtually all the european lower classes used.


Pole arms
Halberds, stylised pole axes


Voulges / bardiche´s

guisarmes


Glaives, basically a large knife on the end of a pole..they got more elaborate during the medieval period

Hammer of lucerne (basically a beck de corbin, but with a spike on the end)


All the polearm genus together;


A really excellent site with virtually every medieval weapon type:
http://www.medievalwarfare.info/weapons.htm

Sorry, I forgot
falchions, the swords of the lower orders.
Basically two types..Cleaver..a machete type weapon..more for hacking and apparently used by woodworkers in particular for daily work when away from warfare
and the Cusped type..a big knife

Cusped falchions

Cleaver falchions

eh Paul....................if it were not you, have to invent!!! All very interesting. Thank you.

I think they would sell quite well.
Spare weapons etc are always good for battlefield "scatter" or for re-equipping soldiers.
Example. A knight that has a sword in one hand means usually that he has an empty sheath ...but change the sword for an axe or whatever and this makes him having an empty sword sheath look a bit odd..even though he could have dropped it as would happen in real life.

One other idea...arrows. It sounds a bit odd but there are arrows made in plastic already, top two figs in this set;
http://www.plasticsoldierreview.com/Review.aspx?id=412
A set of a hundred arrows to stick all over a battle field dio would be very usefull

I do the same..stretched sprue and a pair of jewellers pliers but with every 3rd one it doesn´t work.

PERFECT!!!!
An excellent collection of weapons, each set covers a good range of weapon types

Hello, I translate my message by a translator of GOOGLE, magnificent the idea to make weapons and accessories, I am already very to interest in the prizes (lots) of the swords of hâches and fauchards halberds .............. and indeed on by the rest shields, I would need several prizes (lots) because I prepare a diorama with 400 figurines, the battle of Crécy, a making of transfers for fact 4 boards of 128 French and English blazons which participated in this battle.
When will they be accessible(approachable) ?