For those curious for some actual WWI-themed Toy Soldiers, Sierra Toy Soldiers actually sells a bunch of them on their website. So far, they have French, British, and German, in both Early and Late War uniforms, and they even have Tanks to boot. Alas, they do not sell Tsar Tanks, Zeppelins, etc.

However, they cost about $30 a figure, so if you want to actually get into WWI wargaming, I suggest you look into Renegade Miniatures' 28mm (the same scale as Warhammer) World War I range.