I'd suggest creating a family blog. If I was to do it over again I would have started one right when we got started. You could make posts about what you learn and experience so that family members could read about your life, on their own terms, and hopefully grow to have an appreciation towards your lifestyle choices. And if you are worried about plastic toys, I imagine it would be easy to annouce your preference for natural toys, and opposition towards educational electronic toys without offending anyone. Links to your favorite books, websites and information could be easily accessed and would surely be clicked by family members without you having to preach.
I don't think it's my place to educate my family on this lifestyle path we are headed on, that could very well change at any time. Really, waldorf has opened my eyes and make me want to be a better parent, what I've taken so far has really little to do with education and "things", and more about parenting choices and purposful living. My mom is the only one who somewhat understands what we are striving for, but she pushes her limits and if she really knew more about waldorf she'd pinn it a cult.
I tried initially to educate family, mostly in regards to toys since that's really the only issue that has come up but sometimes I wonder if it was worth it. Last christmas we actually recieved wood toys, they were melissa and doug, but at least I know they heard us, and and bought what was accessible to them.
We live in a very mainstream world, and I don't think most people want to embrace the other side, and choose to live a more slow paced, simple life. But you can show them how happy you are with pictures and words and it could very well lead to your family getting inspired and accepting your prefences.