Here are some ideas for products or solutions that could be out there. Exploit them if you wish -- I will never get around to it for these ones:
PS You can't patent these ideas, because this page is public and so prior art exists. And this site appears to be regularly archived at http://web.archive.org so that can be reasonably proved. Publishing prior art like this was the idea behind the defunct http://www.priorart.org, which now links to an interesting commercial service http://www.ip.com.
These were ones I listed which it turns out have already been "done" at least in some respects: