Re: Looking for ideas. Something simple for a DIY Project ..
Since I do not know what you have as far as hardware, and I do know you have a lot of time on your hands. I think something fun along with profitable you would enjoy.
Try looking in to creating your own Bitcoin miner.
If you have any decent hardware firewalls that have upgradeable processor and ram, I bet you can make a stack of bit farms. It would definitely be worth the time once you finish.
One project I like doing involves old laptops, take them flip screen and create a home network for media centers and have them display around the house, you can go as far as playing media in the home movies music etc. And if you incorporate MVC (Mega Voice Command ) well then you could have a voice actuated home, using the laptops as Controll boards along with media displays, and have a cool interface. The best would be touch screen, or use desktop remote app on phone