How to create a tree from scratch?

Hi guys

Just wondering, if there are any good tutorials or people with experience of creating their own tree’s, including all the LODS and billboards for far off objets.

I think I can

a) Model a tree
b) Create decimated versions of it

Whats got me stumped is creating the necessary billboards.

Any tips would be appreciated.

Thanks

maybe this link would interest you.