I did RTK with flashcards, and I wouldn't say it was easy. I found myself running out of imagination as well, and just saying "oh well" and moving on to the next frame when I was having a hard time coming up with something better than what I already had.
Do you have an iPod, or something you can put podcasts on? Since I got my iPod Touch I've been listening to podcasts pretty much all day long, since my work situation allows me to (and I got them all for free too!). When I get home I'll switch to iTunes, since I'm usually surfing the web anyway. I'm listening to a video podcast right now, in fact. The point here is to not get too caught up trying to really listen, as in focused listening. I'm usually just content with being able to hear the language. It's always there for me to pay attention to when I want to this way, too, besides just flowing into my ears and keeping me from forgetting the flow, intonation, sounds, accents, cadences, inflections, and anything else that goes on with the sounds of language.
I'll send you a PM about how to get anime and other TV shows.