I just discovered this interesting thread.
@DANDAN_THE_DANDAN: I hope you have nothing against me joining this discussion so late in time.
I agree, trying to develop a language of your own is most fascinating but utterly senseless if you don't continue the project. Immersing yourself in the cultures of the world you are looking at can be very rewarding, though.
Here two examples of artificial languages I once develloped, though I neither went through with any of those literary projects.
The first is an example of a Neanderthal language I constructed for a (now abandoned) novel about contact between Neanderthals and Homo sapiens sapiens in late Palaeolithic Europe.
Example sentence: Áfnù-té'ílà-núgò-pà khjú'ì. Níhè'á'árù-íf tshàvné-knéwà-knéwà té'ílà-tàgù-pà'qá.
Translation: I am a difficult storyteller. Children never listen to my talk.
Literally: Story-talking-maker-I difficult. Child-plural listen-never talk-my.
The second example is from a Fantasy novel I barely ever began. In this novel, the Sylphian language family consisting of the three languages Light Elfish, Wood Elfish, and Field Elfish (the latter two being more closely related) is baced on Ancient Egyptian language. Here a little example of an elvish prayer.
Example sentences:
Yohit mawit naforit, sho-atsh wopit. Mo'ot-atsh dshasarit. (Light Elfish)
Yehiy ma'iy naferiy, she-adsh ebiy. Me'ey-adsh tshasariy. (Wood Elfish)
Yehiy ma'iy naheriy, ze-adz ewiy. Me'ey-adz tzasariy. (Field Elfish)
Tanslation: Beautiful mother mooness (the second, smaller moon thought female), your light is pure. Your truth is holy.
Literally: Moon (f.) mother beautiful (f.), light-your (f.) pure (f.). Truth-your (f.) holy (f.). I have placed (f.) whenever a word was written with a specific female grammar form.
As you can see, constructing langages is terribly difficult and ultimately a waste of time but can also be very rewarding.