[wikwocket]

A daily email newsletter would be a great easy place to start. Lots of people would sign up if you made it frictionless. Bear in mind that, with a daily email, lots of people will ignore it or delete it unread if they are busy (as opposed to unsubscribing), so don't trust your subscription numbers, but lots of people will get value out of it too.

The other option that comes to mind would be a background app that changes your wallpaper to your image (with quotation) daily. Or maybe a browser extension that changes your homepage/speed dial background to this periodically.

If you want to try mobile, you could make an app that changes the phone's lock screen each day. But promoting the app would be difficult.