I have submitted a new iOS application to Apple: MrCombo. This app lets you build lists in a two-level hierarchy: combo > group > item. Then you can shuffle the items to mix it up. Sample data includes ordering a pizza and picking an outfit, but you are meant to create your own combinations.
Yes, it's a bit silly. But I find it fun and useful so I thought I would release it. For now MrCombo is free, but if I keep adding more features that may change.
If you run into problems with MrCombo, you can reach me through the App Store or post a comment right here.