Last week I stayed in a hotel in Barcelona and pilfered all the toiletries (including 3 complimentary combs) as well as the packets of tea and instant coffee from the complimentary tea tray. Yes, I know it's expected, but I still felt a little guilty.
Turns out I shouldn't have. Hotels these days expect you to steal all sorts of stuff - as this CNN article (which you will note, I'm linking to but not stealing) notes - and some actually don't mind, figuring that every time you look at the pilfered item you will remember what a good time you had when you were there last. The thinking, it goes, is that you'll then return - personally I'd think I'd be too embarrassed.