How sad is this? Mostly what I have to compost is coffee grounds and fruit peels! I don't cook and I use my the mulching setting on my electric lawn mower so I don't have clippings and around here it's a badge of honor to let your lawn go dormant in the summer instead of watering it. I might not be a good candidate for this, after all. But I LOVE IT! You're like a super hero in disguise with your Undercover Composter!
You can still compost with coffee ground and fruit peels. My stuff in my bin is mostly coffee grounds & kitchen scraps. I don't have a lot of yard waste either so I use shredded junk mail & paper from my recycling bin for my nitrogen source. Other stuff I compost is dirt from my sweeper, dog fur tumbleweeds (my dog is the long hair guy in my avatar. Come summer or after I brush him he sheds a lot!), cotton dust rags (I used the leftover scraps from t-shirt surgery as dust rags), and recently a compostable corn based plastic coffee to go cup (the coffee shop just switched to paper cups with corn based plastic tops and said they'd compost. So my husband and I brought ours home and tossed them in our compost bin to see what will happen.)
You can make quickie compost by mixing coffee grounds and ripped up/shredded paper (junk mail is a great source of paper for this.) I did this last spring (before I made my compost bin) for my potted herb plants and it worked out well.
Junk mail! That's something I have more than my fair share of AND I tend to shred anything remotely "personal" so that my identity can't be stolen from my recycling bin. Great idea! I use these corn-based sweeping clothes with my O-mop (Method's version of a Swiffer) that are supposed to be compost-able, too. I heard that my city is going to start allowing kitchen scraps in the yard debris recycling, too!
Anyway, I may have to give this a go. Thanks so much for sharing and being attentive to my questions, etc. Good luck and please keep us posted on how it goes with your compost and your condo police.