Yaknow what? Because you double posted, I'm going to let loose on you
Ok
Fel Goblins: Can't happan. No demons would corrupt goblins, they already have the Totherezium selling things to them
Grim Reaper statue: What sort of crazy death-worshiping cult is going to make one of these?
Undead Night Elf: Can't happan, Night Elves were on Kalimdor during the plague
Bloodelf Buildings: Just wait. There's 2001 various High/Blood elf mods
Blank Firelord: Already done. Learn2search
Draenei icons: What use are icons without models?
Villagers: Your only worthwhile request
Tree with vines: You can just use a tree doodad and add vine doodads
Tropical tree bridge: Eh, easy to do
Shield ornaments: Simple
Futuristic signs: Why bother?
Nuke bay: We have a missile silo, isn't that good enough?
Soviet thingy: This is Warcraft, not Red Alert
Gladiator: They have varying appearances. At that, they're not frontline fighters, they're people who fight for sport. I reckon there's a few skins or models around of them
Caeser: A noble hardly seems appropriate for a game like Warcraft, aside from a cinimatic maybe
Space marines: Already done, learn2search
Darth Vader: Pretty sure its already done, learn2search
Stick figure: Already done, learn2search
Halo Marine: Already done TEN THOUSAND TIMES OVER probably
Halo door: Meh, generic door
Zebra: Olof already made a skin, learn2search, I requested it from him ages ago
Hippo: Eh, has potential
Aztecs: Potential
Modern soldiers: I'd say no instinctively, but someone's making a few of them or something
The Lich King, a mighty combination of Arthas and Ner'Zul who is both of them, yet neither of them: Already done, learn2search
WC2 Demon: Done several times
Your requests lack in the necessary level of awesome