So, here's a cool thing. These folks at an outfit called Diatom have a project called SketchChair, maybe with a space, I'm not sure. They're developing software that will allow you to design your own chair, and virtually test it for structural stability and comfort. Then, you can have it digitally fabricated and shipped to you. The software will be open source, with the aim of allowing designers to share and collaborate.
The other cool thing is that it is being crowd-funded through this outfit called Kickstarter. What Kickstarter does is collects funds to support creative projects like this one. They set a pledge goal and a time limit. If enough people pledge to support the project, they get the money. The pledges turn into donations only if the pledge goal is reached in the time limit.
The idea is that donors only actually give money if there are enough people giving to make the project go. These are donations, not investments, although it sounds like the project fundees typically offer something to donors. For instance, a donation of more than $300 to SketchChair will get you a chair.
If you're interested in supporting SketchChair, you can check it out here.
Kickstarter funds all sorts of projects, from film to writing to dance to food. If you want to see if there is anything that tickles your fancy, you can check them out here. I've just stumbled across this, so if I find anything particularly cool, I'll post it here.