Lol! I would do that as well, but I am afraid of what I would 'ave to come up with if a friend wishes to borrow m'computer and m'screen is just... collage, collage of random characters everywhere.
Me: "Uhm, ahh... *fiddles with fingers* Oh! 'Twas just using them as inspiration while I learn how to draw them. Yea! That's it. *nodding very awkwardly*" She sees right through me, I know it.