I can contribute to this thread, but I'm at work at the moment where I have nothing, and when I get home I am without internet lol.
Edit: Actually, I may have some VERY old designs on my old myspace page, I may pay it a visit and post them here. I'll be back momentarily.
Edit2: I actually found them on my Facebook page lol.
These are 3-6 years old and while the drawing in them is pretty decent, the actual realism and shaping of some of the elements is questionable.
These obviously are fairly detailed version, I do however always do simply line drawing layouts of coasters before I build them in NL, I don't have any of those to hand right now, but if this thread is still around in a couple of weeks when I have the internet at my house, I will definitely upload a few of them.
Btw, this is a cool thread, I am interested to see other people's styles!