I don't but I know people who do! Some have a page dedicated to "bad icons", just curious what classifies these icons as bad and if other people actually do this.
I hate apps with ugly icons. When it comes to UIs I'm very picky, and after being spoiled by iPhones interface I always notice even slight imperfections in UIs now...
I find it annoying, but I will still use the app if it is good. How hard can it be just to put a little effort into designing a pretty icon. It sits like a turd in the middle of your nice new carpet.