if I'm really bored I usually just go and grab a cup of coffee from the common room or something... if I'm feeling generous I might get some for the teacher/mates!
if you've switched off in a lesson, then there's no point in carrying on if you're not going to switch back on... most of my teachers appreciate this fact, coffee usually gets everyone in the mood
Colour in the spaces in letters on sheets (like the inside of the a's, e's etc)
Hah, yes. Doodling, throwing things, sending notes to my friend who's sat next to me, pretend I have a dentist appointment (it's believable since I have plenty), drawing pictures - we have a game, or just getting on with work and not paying attention to the teacher.
I draw .. think about what I'm going to do that evening (usually this kind of lessons we have on fridays).. talk to whoever is sitting next to me.. text my friends.. lots of things .. If we are allowed to use laptop - my problem is solved