Take a look at this amazing picture, where everything is made out of food (hence the name foodscapes) - Carl Warner sells this pictures on his website, where he also displays work from other genres. But it is impressive, if you take a look at the details, you will find that everything is made from food - Take an extra look.
This is a partly free and paid site, where you can get learn great techniques and get inspiration to try out on your own.
Vectortuts is part of a network of tutorial sites, with the same great quality feel. Sites include PSDTuts, Videotuts, Nettuts and Audiotuts.
Check out the site, if you would like to cut some corners on the learnig curve.
If you like pen and paper to jot down ideas and work on projects, then the “free” you still have to pay for the print-out 
graph paper website is for you.
I really like the isometric templates, which is a great help.
Check out the Graph Paper website
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