Not a particularly new app but my wife just downloaded this for our twenty month old Peppa Pig loving daughter and she's enthralled by it.
It's pretty much a Peppa Pig activity pack that you would buy in the newsagent with out the problems. No peeling stickers off the floor. No worrying about them colouring the couch as well as the pictures and its completely free.
Also its quite entertaining, there's multiple scenes the child can paint over. There's animated stickers such as Mrs Rabbit in her helicopter and muddy puddles as well as interactive ones like the bubbles they can pop. Of course being official its got a wide range of the characters there as well as the correct voices to match.
If you've got a little 'un who's into Peppa Pig and don't mind them playing with you iDevice this is well worth a look.