I would love the minigame 'Stealing Creation' in blitz. As you have said in the past, the leveling is going to be much more complicated on Blitz, so why not make this to give you double the exp, but of course you have to spend some time working to get the sacred clay items, so it wouldn't be like a very easy thing to do, but it would be overall better than training. An example; many people in RuneScape have achieved 99 Fletching by now because of the Sacred Clay knives giving you double the exp for whatever it is you may be fletching, make the process take no time at all when you have these knives. Now I'm not saying everyone used this method, but it was just an inspirational thing that Jagex came up with to encourage players to train more, and I think it has worked quite a bit. This would be a lot of work to add into blitz I'm sure, but it would be something worth while of looking into and adding.