@Dez - My process is actually really simple. I prime it black (mostly because I only have black primer atm). Then hit the model with a bone colour -I didn't want too bright of a base. Then I hit the model with pure yellow. With the bone underneath the yellow goes on so nice, I find it works better than a white base. Then I hit the back with a red, the front quarter with orange (facing the red) and the back quarter with purple (facing the yellow). Lastly I wash it with the GW purple wash. Since the purple is the darkest colour on the model, I chose a purple as a wash to blend the colours together. The wash goes into the recesses and gives that shade look but since it is purple, it works. I make sure to wet a brush and clean off any high parts of the model since I don't want the lighter colours to darken too much (and washes aren't incredibly accurate on drying - even with medium).
It's quick and easy, just have to work with a colour (usually the darkest) on your model and as long as you babysit it (don't let it pool, brush off excess, etc) then it gives a pretty decent shadow look without spending too much time.
I thought about doing line edges with highlights but I didn't want to put too much colour into them since they were fairly colourful to begin with. I might try it on a test model and see if it works.
For the rest of you, apologies on not uploading the Flyer and Vypers, was busy and then when I did have time I got distracted with a Farseer. Here are the pics, I think the gold really helps break it up and sell the look more. Kudos to Spiraling for kicking my butt into actually doing it LOL. Still waiting on my lightbox (was back ordered, I bought an entire photography kit so comes with the lights, the "box", everything) so please excuse the paintbooth pics:
