[go easy on the non-tech guy]
A couple I've thought up but never had the time or know how to make. If you want to take any of these and run feel free, if you'd like to talk more about any my email is in my profile:
-A dating app that more closely mimics real-world dating by bringing spontaneous discovery and subtle-interactions into play. Traditional dating apps require you to a) know what you want and b) know how to find that in a text-based profile. That's not how the real world works. In real life dating you either meet through a third party (friend, roommate, classmate) or you randomly meet this person in a bar, library, etc (serendipity). In the latter case you choose to interact or not based solely on a) attractiveness and b) very basic personal information (age, general personality, intelligence). This app would try to closely mimic that form of meeting. It would also control a major pain point with current dating apps where men send out hundreds of messages without hearing back and women tend to get buried in a sea of copy and paste messages. It would do this by first requiring the female (in hetero users) to indicate interest in the male (real life: raised eyebrow/come hither look). Men can say they are interested in a girl (real life: buy her a drink) but they cannot interact with them any further until the woman says she is interested. The idea would be to start this in colleges where the majority of users are of similar demographics and actively seeking casual dates/hookups.
-an online marketplace for premium artisan greeting cards. i've always thought there was a market for the $10-$20 greeting card as long as you can really bring something people want. You see it with Hallmark trying out fresh ink and with the rise of Papyrus. The idea is that you can find plenty of very good artists who are looking for a way to pad their income. Personally I'm family friends with a good number of cartoonists but a look in any liberal arts university could surely uncover 5-10 quality artists. So the idea would be to seed the site with numbered, limited runs of the best of these artists greeting cards. You would need to find a quality printer and make sure your packaging is worthwhile but if you could seed the site initially with 10-20 new/unique quality greeting cards it could turn into it's own machine. Especially if you allow artists outside those you "invited" initially to submit their entries and have the top 5-10 make it to print each month/quarter. After allowing for printing and shipping costs you could give the artists 60% and take 40% of the proceeds. If done right this could be a place for artists to get started/make extra money.
-and iphone app built to be a "personal assistants assistant". An app that can take a persons calendar (google, outlook, ios), travel plans (tripit), address book, etc and make common tasks for a personal assistant much easier to do.
-a site/app that makes it easier to find a workout partner. it's been shown that people work out harder and more consistently when they have a workout partner but finding one (especially in urban areas) is incredibly difficult.