> willow and bamboo depending on the variety can be fast growing
> and be useable in just acouple of years

I would check around before growing bamboo. It's a vicious, non-native, invasive grass that will take over not only your yard but the yards of all your neighbors. Growing it in pots is one precaution, but you may end up alienating all your co-owners if your bamboo takes over. See
http://www.gainvasives.org/weeds/bamboo.html
for some information.

Using non-native plants (like the eucalyptus, which is a filthy, shedding tree that burns its eucalyptus oil like a torch if it catches fire) troubles me, but to each his own. Look on the Web and ask around (not people who sell them) before you commit to planting stuff. Remember, people thought kudzu was a good idea. :->
http://www.yahoolavista.com/kudzu/houses.html