I don't have pictures YET, but I will soon.
Tamagotchi Mini is exactly the type of Tama you'd want to take to school unpaused. (Granting you turn the sound off, of course.) They barely need any attention at all, and when they do, all you would need to do is feed it, give it a snack, or simply cure its illness. The directions will tell you how to do so - it's very easy.
I recommend buying one if you have a busy schedule.