I like your story ideas, but I wonder (seriously) about the need to crank everything up to the "astronomical" or obviously ridiculous. One of the things we are trying to do with our 2.5 year old daughter is keep our stories fairly realistic and avoid superstimuli. I'm amazed how hard it is to find books that don't involve talking animals with oversized eyes doing ridiculous things. Fortunately her favourites are the Charle and Lola books which involve two fairly normal kids doing everyday things in a fun way and using their imaginations. Not a lot of strict rationality techniques but plenty of good everyday problem solving. And she just loves them. Thanks to the op for starting this thread.. I'll give it some thought and try to come up with something..