Okay...
First of all I wanna say TNX to everyone!

I'm trying to combine the suggestion from Umbrella and kbrown ...
(Sorry Phopojijo, but I'm probably *too-much-noob* to understand what you suggested; although it sounds pretty interesting..)

I'm emitting particles from the can's surface and replacing particles with a pair of NURBS shaded spheres... It seems to work ;-)

<BUT>
Now the problems are:
- How may I kinda "constrain" the emitters not to trespass the can's shape more than a half of their respective diameter?
(Just the way they would act as if they were Nurbs object placed on a "MadeLive" can)

- Is there a way to set a "range" of random scaling for the emitters' size, in order to make 'em look more realistics?
(i.e: from "0.5" to "1.5" of their original size).

(If it all could be done without MELs, I'd be glad to know it ;-)p

…
I've got ALOT of other questions, actually, but I'll keep 'em for when those two problems are solved.
(If you don't mind me keepin' on asking, of course ;-)

TNX again!

cià
ale

p.s.: Does anyone knows if I can buy a copy of "3d World Magazine" in Italy? Or someone who's got it could kindly post the tutorial Pure_Morning was talking about?