When it comes to modern, there’s little moreso than the iPhone’s “Slide to unlock” symbol. And while you could get it from clever tease on Cafepress in all kinds of different styles, somehow it seems just begging to be worn on thong underwear. Made in the USA of 100% cotton for just $12.99
Print Liberation is another US designer/manufacturer with a “Big Mac” t-shirt of the original Macintosh. Printed in grayscale on a good-looking cream colored shirt, this one is another relative bargain at $18.