Icon Help

So, I was on the train to the NY Anime festival today. I was pretty bored so I got various ideas. This one was to make a new icon set. If you haven't looked through my gallery, these are my free iconsets for use.
oceansdream.deviantart.com/art…

fav.me/d204prm

But I felt like I should make a new iconset. So I would like some input on it! Obviously I cannot take everyones request especially if it conflicts, but I'll try my best! First off: Like the other 2, these will be free to use as long as credit is provided (Commercial or non-commercial). They are NOT project specific. Specific icons for this set cannot be something that belongs to an existing game/anime, such as pokemon icons, final fantasy, etc.

Now, for input:
-What size should I make the individual icons? 16x16? 24x24? 32x32? Another size?
(24x24 is for better use in the RPG Makers, but 32x32 might be more standard. Might take a vote if I really can't decide)
-I am considering a Medieval fantasy sort of setting, so what kind of icons do you think would be useful if you were to use this? I can do things like the standard Swords, Armor, Magic, but sometimes I get forgetful and miss things that could work well. I may not use EVERY suggestion I get, but feel free to suggest, I will definitely consider it.


--SPECIAL NOTE!--
Most of the works in my gallery are either for my game or an example from another game I've worked on. So don't use them unless I explicitly state it's for use!
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Any help with this would be appreciated! My current goal with it is 25 icons, but I will likely expand on that as I come up with or get ideas.