I picked up AEG's Ultimate Toolbox and have to agree that it has some useful stuff in it though I don't like the constant spreading out of material over multiple charts when one chart would have been enough. I agree about Dawn of Worlds, concerning cosmology, in addition to a few other aspects. There is so much that could be done with the game, but combining the two products together might be helpful none the less.
One thing I think might improve Dawn of Worlds would be to add a deck of event cards to it as well as another smaller deck that might cover another element not covered by the game, perhaps an interaction deck that allows you to interfere directly with or change something done by another player.
Here are some thoughts on how the event deck might work. First it contains a selection of events that could happen with some events being more common than others. In addition to commonality of the events certain events would have an additional effect of once played they would cause the discard pile to be shuffled back into the deck, representing how certain events while rare still occur repeatedly through history, i.e. ice age, devastating earthquake, or super volcano eruption. Other events would be purely one shot in addition to being rare or require all the players to agree before it gets put back into the game, i.e. cataclysm.
Any thoughts?