So, I finally organised my fantasy art collection and uploaded it all to imageshack. Annoyingly, they do not provide an 'All Albums' link like the other services do, but they're the only one that could handle all I wanted to upload (Although a 5.1mb jpeg is a bit for them apparently, heh).
So, I'll just link them all here (In no particular order). They're sorted by what the picture most struck me as being of. If you're looking for something particular, try more than one category (for example, you might be after a plate-armoured cleric, so try the Knight/Paladin category as well as the cleric one, or the Monsters and Dragons pictures sometimes have characters fighting them that might suit you.)
(Disclaimer: Yes, I know imageshack occasionally causes pop-up windows, and I'm sorry for using them, but I couldn't find any other image hosting service that did what I wanted and / or didn't annoy me).
Mages: Your general caster archetypes, Mage, Wizard, Sorcerer, etc.
Swordmages / Avengers: Light armour, swords. Some could also work for rogues / blade wielding casters.
Pirates: Do I really need to add a description?
Invokers / Clerics: More your Divine Caster types.
Knights / Paladins: Heavy armour types.
Dancers: Again, do I really...?
Miscellaneous: Stuff that didn't fit elsewhere, or I threw in here cause.
Rogues / Assassins: Light armour, daggers / smaller swords, generally rogue-ish looks.
Archers: Using bows, maybe the occasional xbow.
Weapons: Weapons by themselves.
Tieflings / Devils: Fairly self-explanatory.
Blackguard / Dark Clerics: For your more anti-hero, HoS types.
Monsters / Demi-Humanoids: Nagas, some undead, a hydra or two... I think there's a minotaur as well.
Landscapes / Backdrops: Some beautiful / epic backdrops for your character or encounter.
Humans: Humans, not definably of any class in particular.
Pixies: Cute little buggers, aren't they?
Elves: Again, kinda class-less.
Dwarves: Dwarf is a class, right?
Angels: And not in the 4e official art way. (I don't like those.)
Artificers / Alchemists: Should be pretty obvious by now.
Dual Wielding: People with two melee weapons.
Animal Companions: People with a familiar, beast companion, mount, or the companion itself. Think beastmaster ranger, sentinel, fey beast tamer, arcane familiar.
Mixed / Multiple Characters: Picturess that belong in more than category by content eg: the one with the Elf and the Dwarf.
Monks: Okay, more monk, singular, right now.
Bards: Generally, musical instrument included.
Druids / Shamans: Primal-y types.
Fighters: More your medium armour, weaponmaster types than the Knight / Paladin category. I know it's a bit of a fine dinstinction, but it makes sense to me.
Drow: And dressed like 'em too.
Warlords / Ardents: Those who lead by example (Or throw Slayers at people).
Vampires: Now with more blood!
Hexblades: ...damn, can't think of something smart to say here.
Warforged: Were I ever to play one, I think I'd base it off Tio from Grandia 2. Cause dropping massive arcane spells by quietly calling out the colour of the spell effect is awesome.
Warlocks / Dark Casters: Again, for the more anti-hero, messing with forces you don't understand types.
Will add more every so often, probably a batch at a time.