As you will hopefully know, there are simply not enough hours in the day for sparks to make all the modules suggested, so please read this board's rules (here) before posting.
1: Check concepts first. Your module idea may have been scrapped, declined or in progress.
2: Make sure nobody else has posted this before. Sparks gets some suggestions loads!
3: Check the module doesn't already exist (more or less).
Thanks for your time with posting a module to this board!