Project you might use for pennies but didn't find any.
Maybe image resizing, watermarking or any other you wish existed.
The current solutions are comically expensive compared to doing it yourself. I'd like to see a Digital Ocean-like solution cost wise.
Take for example Cloudinary, which basically offers this type of service. Their $49 / month package offers 15gb of storage and 50gb of transfer. It's so expensive as to be silly if you want scale. By contrast the $40 Digital Ocean package offers 60gb of storage and 4tb of transfer. Cloudinary's $149 (!) package offers 50gb of storage, and 200gb of transfer.
Why not leverage AWS or similar? Their bandwidth costs are obscene, at least 20 times higher than what you can get with a cheap dedicated server.
Someone should be able to do this service for $10 / month, with a minimum of 20gb of storage, and maybe 500gb of transfer. And scale packages up from there.
http://sideprojectors.com (I run the site by the way).
It's a market place where people buy/sell/discover side projects. You might want to check some of those projects. Maybe there might be some that you would be interested in buying, or just to be inspired from. :)
Without knowing anything, I would suggest selling services/freelancing. Your gross margins are high and you usually don't need initial investments.