I have a Facebook page (in Indonesian language) where I upload pictures with hangeul letters, and then I ask people to read the hangeul and answer my questions. Usually, people are nice enough to play along.
You can make your own pictures very easily. Basically, you just need to get a screen capture and type letters on it. I use a free software Skitch from Evernote. Download it here.
Make your Facebook page here and start practicing your Korean, or whatever. ###