Helloa,
Enough people had asked me about my tyranid schemes that I finally got around to turning the process into a proper tutorial. Plenty of photos and step-by-step discussion (if maybe a bit wordy in places) are included.
Tyranid Painting Tutorial It focuses on my two schemes, the 'desert flower' and 'blue crab' types as seen on my site
Necrotales, but should be easily adapted to a wide variety of other nature inspired schemes.
Hope it's useful for folks. Thanks!
-Kep