You should find a bone, or white, coloured paint and try dry-brushing one of them next
Actually, have thought about this some, and if you do want to give this a go, what you should do is find your local Games Workshop, go in and ask for "a Small Drybrush", "a pot of Tyrant Skull", and "a pot of Necron Compound" - that will get you 2 pots of drybrushing paint - a grey metallic, and a bone colour - and a brush to apply them with.
Oh, and to avoid awkward questions, you may wish to make out that they're a present for your son, or a nephew, or some such (trust me, if you even hint at the fact that you might want to use them yourself, you'll get asked something like "OH, what army do you play?" and then, if you try and bluff your way out of it, by mentioning say "Oh, Orks", or "Space Marines", or whatever (should you even know enough to know what to say), they'll then follow it up with "Oh, have you seen X, Y, & Z", and then proceed to go a get Z, Y, X, W, V, U, T, & S, all off the shelves and pile them into your arms! (and saying "Oh, I don't, I'm just painting some figures" is just as bad - they still come back with "OH, what army?" or "what's your favourite figure and/or model?" or something) - the staff are paid to sell - so it's best to make out like you're a parent/uncle that knows nothing of these things and have just been sent into to get little Johnny a present).
Now, the reason I recommend this is that the two pots of paint you'll end up with have been formulated just for drybrushing - they have the consistency of mousse - which is a very odd thing to a seasoned painter - paint just shouldn't be like that - however, it does work really well.
Then, as I described before, you take your drybrush, get just a little of the paint on the ends of the bristles, then wipe it back and forth on a paper towel until it looks like no more paint is coming off, and only then do the same over the surface of the figure (obviously, using the bone colour on the bone areas, and the metallic colour on the metallic areas).
And remember - you can always easily add more paint - but it's not so easy to take it away - so when I say wipe the brush back and forth on a paper towel until it looks like no more paint is coming off - I
really mean that - if you do end up wiping it all off, and none then comes off on the figure, you can always have another go - but, if you leave too much on, you'll get horrible big streaks of paint, which you don't want!
And, here's a video to show what I mean:
http://www.youtube.com/watch?v=Tj9XNbwfwHo (but note, he's using normal, 'wet', paint (I couldn't find one that shows drybrushing with the GW dry paints) - with the dry paints you don't need to get quite so much on the brush to start with, and you can skip the waffle about brushes at the start (some of which I don't entirely agree with (and which he contradicts himself on anyway)) - but the way he brushes the paint on to the figure, the wiping the excess off, and what he says about using your hand to test whether you've got the right amount left, that all applies).
