Check out the items after the image and as River Song would say, "Spoilers."
Her Universe had items for the event before it aired. They posted teasers of the 50th apparel last week with question marks instead of images and revealed the graphics as soon as the special was over. You can choose from five different tops over at Her Universe, but these are my favorite designs:
Over on Etsy you can find bracelets featuring specific quotes from "The Day of the Doctor" as well as more general products just celebrating the 50th.
"Neither cruel nor cowardly. Never give up. Never give in." Spiffing Jewelry has a few different quotes from the special (and there were so many fantastic ones).
Gallifrey falls, no more, and Gallifrey falls no more are phrases I expect to see all over clothing and mugs and everything over the next few months. This charm is by Alicia's Art and is the only 50th item in her shop for now.
Keep your place in the book you're reading with all 11 Doctors. This bookmark by Graceful Diligence doesn't include the War Doctor, but it's still awesome.
"I've had many faces, many lives..." This typography poster from TARDIS Blue Wings says it all.
One special, three doctors. Commemorate the occasion with this poster set from the Art of Logan Pack.
And now, I need to watch "The Day of the Doctor" several more times.