I always liked altering other magic items (like rods or rings) into wondrous items with the same effect. That way you don't have to take extra feats to make those other items. Instead of a ring of protection, make an amulet of protection. Instead of an immovable rod, make immovable boots. Sure, uncustomary space limitations cost 50% more, but now you've got spare feats!
Also, use contingency to add contingent effects to items.
Ditto Hella, though. Don't double up on the item creation feats unless you really need to (although if you're going to double up on any of them, Craft Wondrous Item would definitely be at the top of the list).