A month or so ago I made myself an Eldritch Horror insert with the excellent plans supplied here http://boardgamegeek.com/filepage/100054/eldritch-horror-box.... I was very happy with the insert, but once I added Mountains of Madness to the base game and Forsaken Lore it was too much for my new insert to handle. I decided to design a supplemental insert that would provide a removable caddy large enough for all of the mini cards and individual card trays for each GOO. I'm quite happy with how it turned out:
It isn't shown in these images, but the small void on the side of the mini card caddy works well for holding dice.