Since last few years I have been maintaining a Trello board of all the ideas I get to work. While none of them will make a successful startup, but they can definelity be an interesting side-project. These ideas vary from creating a browser extension, to a webapp or a mobile app.
Today I am making that board public. You can view them, comment on them, suggest features, or even take it & implement it yourselves. Who knows one of you might push me to actually start implementing these ideas ;)