Probably may not be very popular cause it may be considered political but I would participate in charities that help with civil liberties and separation of church and state. The charities you listed as feel good projects. It's harder to convince people to do the right thing than raising money or buying stuff. But than the "right thing" is subject to people's wims.
I think about something that would protect the rain forests (if that is not already a part of the recycling charity).
This project sound like a really good thing to do. Good luck with it.
Testicle cancer is not something to take lightly and to laugh about. There are many issues of the kind concerning society in my area. Please take a close look, you may be interested in having it shown for a good cause.
If you are considering something that will benefit the planet and the worldwide population as a whole, (human and animal) I think your best choices will be environmental charities. I agree with one of the other posters on this one, protecting the rain forests is extremely important considering the amount of oxygen those forests create for us and the rapid rate that we are foolishly destroying them. These forests are old, they are not something that can recover quickly, not even in a few human generations. We need to protect the rain forests that still exist, stop the unbridled spread of agriculture into the rain forest areas, and the logging as well.
Not only does it destroy the very trees that provide us with life giving oxygen, those trees also help scrub the filth from the air that we pump into it by the millions of tons every day, and help to regulate and maintain a moderate climate ... not to mention loss of habitat for endangered species of animals and plants. And the extinction of plant species that may well hold cures for serious diseases.
The same case can be made for charities that support the protection of our seas and oceans. The plant life there also produces an abundance of oxygen, and supports the other sea life and fishes that we heavily depend upon for as a major food source. If our oceans fail, we die. Period.
So there you have two that benefit the planet as a whole, not just humankind.
My 2 cents,
To collect money, one thing you can do is bake cookies and sell the cookies at high profit. Make sure you specify that the money is going to a good cause though.