Here's an interesting project that combines participatory citizen science with crowdsource funding models.
American Gut is a project to catalog, analyze, and compare microbiomes of a diverse swath of Americans. Microbiomes are the bacteria that live in you (and on you). They're both separate from your body and a part of it. Scientists want to better understand what bacteria live with us, what they do, and how the populations of bacteria change depending on factors like your diet, where you live, and your ethnicity. The project is entirely funded by crowdsourcing, so how you participate is also how you donate. For instance, in exchange for a $99 donation, you'll get a kit that will enable scientists to do DNA extraction and 16sRNA sequencing on the bacteria they find in a sample of your skin, saliva, or poop. After they've studied the sample, the researchers will present you with information about your microbiome and how it compares to those of other participants.
You can sign up to donate/participate anytime between now and January 7. There are also a few opportunities available for people who want to participate, but can't donate any money right now.