reminds me of a growing type example i made a while ago
http://vimeo.com/11766578
it actually works the same way. you load an bw image, in your case your logo. read it using pixels[] or get() and seed some moving particles where your image is black and let them draw your growing branches, get smaller, and die after a given time.
there are probably other ways people will suggest but thats one of them that would work.

you could also try out diffusion limited aggregation, it can give you that type of effect. It is similar to the spawning particles, it just differs in how they decide where to display.

Can someone please help me with the particles?

I don't know how to seed them "into"/ "under" my black pixels...