No, I have very many ideas. I have neither the time nor skill to do anything with them. I write them down and I'll put them on a bit of WWW space sometime.

EDIT: Some of the more sensible are around behaviour modification. They're all a bit UK-centric, but modifiable.

EG

1) drink diaries. People aren't aware of how much they actually drink, so an easy way of keeping track and then converting that into the UK standard "units" would be good.

2) Budgeting for poor people claiming benefits. Benefits might be changing to monthly payments (from fortnightly). People say this is going to be very hard to adjust to. A simple app to help people keep track of money in and out is handy. What makes this "fun" is the need to make it work on not-smart phones and non-data plans.