Yes, caps should be ok also.
Best impact is using complementary colours, but not all of them. You already know: red on white, black on white. Because youa have to use blue, it's bad to have a black background (not enough contrast therefore not visible from 20m or so).
Good idea to have it simple, but you have to spread more curiosity among people. Inception. So, more words (on a flyer or on back of the shirt or at the bottom of the shirt. Just one sentence. Something powerful enough but not like an old boring scam. Something clever. I don't know yet. "The only community that pays YOU.", "blog, comment, get money! No bullshit.", "post, like, earn. No bullshit.", "this is TESLA for social media.", "the REVOLUTION started. Google this: steemit." And more.....yiu know....
So, blue on white. Google steemit and you'll find some nice art from steemians. Get in contact with some for colaboration/copyright. Their art is just awesome. I'm on my phone, I can't give examples.
Good luck.
Thank you very much! I see your point and I appreciate all the help. :)