I like this idea ~ have been leaving my bucket lid on cockeyed with a couple bricks placed strategically on top. My pullets can get in the feed room through a broken board. Came in one morn after having left the lid off and one of my gals was sitting waist deep in the ff, ha!
Maybe I could secure the towel with a large rubber band...
Currently, I'm using a sheet that I just drape over the bucket. I did buy a few pillow cases from Goodwill for 49c each and plan on cutting them down to size and then sewing a cuff on them to make sure they last longer. I will probably sew an elastic band in to the cuff to ensure that it stays tight against the bucket. You can easily add in a drawstring with one of those sliding cord locks instead of sewing in the elastic, too. If it's left outside or in the hot garage, the drawstring would last longer. You can find the thin rope and cord locks at WalMart in the shopping section and probably spend less that $3 for it all.