MOSCOW (AP) — The imprisoned brother of Russian opposition leader Alexei Navalny has drawn a set of stickers depicting life in prison for a popular messaging app.

Oleg Navalny was sentenced to 3 ½ years in jail in December 2014 for defrauding a cosmetics company in a verdict which was largely seen as retribution for the political ambitions of his brother, who got a suspended sentence in the same trial.

Moscow-based urban planner Pavel Akimov says he has approached Navalny after seeing his drawing in the media with the idea of using them on Telegram, a popular encrypted messaging app.

Some of the stickers, drawn in pencil, are bleak, illustrating guard brutality and suicide; others are ironic and black-humored. Telegram accepts user-generated content and these stickers are available online.