I want to discuss with you what good project to support via signature campaign, but I have found the right project for me to support, hopefully the result can be good as expected
You can certainly join depending upon your interest like if you want btc then join the campaign which is paying in btc else if you think some campaign which is in Pre ICO stage and paying in token of their coin and which seems to have a good future you can participate in that and collect their coin which will bring some fortune for you if those coin in future trade really well.