From Salman Hameed of Irtiqa:

Children have been used in war throughout history. However, modern weaponry is making the contrast of innocence and violence even more extreme. The use of children has been especially a problem in several wars in Africa, and we have all seen jarring images of young children holding semi-automatic weapons. But the Taliban is taking it to the next level: child suicide bombers. Here is an article (and a video below) that talks about the use of paintings of heaven (yes, with rivers of milk and honey) on children as young as 12 to recruit them for suicide missions. The story that the Hashshashin, a Shiite Muslim sect in the Middle Ages, used hallucinogenic-induced dreams about paradise to recruit their assassins may turn out to be false, but the legend may still have legs. Though not short on opium, the Taliban instead have decided to use imagery of paradise on impressionable young kids (check out the slideshow):

“I have never seen such elaborate paintings about so-called heaven,” Taliban expert Zahid Hussein says, looking at the images.
He has seen similar tactics in the past and spoken extensively with would-be child suicide bombers in the custody of the authorities.
“They [the militants] say life is a waste here and if you do a good thing you will go to heaven, immediately to heaven. For someone who does not have anything to look forward to, who does not have any opportunities and is living a wretched life, this sort of thing comes as a big incentive,” Hussein explains.
He says the children end up believing that their life in this world is worthless, that life only starts in the hereafter. The Taliban is offering them a fast track option to paradise, a longed for escape from their daily reality surrounded by violence.

And here is the video: