I just launched a bounty program for my ICO and I have different campaigns people can promote on EXCEPT signature campaign. I've taken a look at signature campaign, but not sure how people create such complex signatures which have images and clickable hyperlinks. Any thoughts on how that is done?
You can take generic signatures from other Bounty campaigns and insert your links and info. Not a great idea, but at least you will practice in making signatures
I don't think that would be a good idear tough... AFAIK, there are no generic signatures. Every signature was designed by somebody on this forum. It's possible the original designer will not care if you "borrow" his artwork (intellectual property), however, it's possible to original author will start a scam accusation if you decide to use his artwork.
What you CAN in fact do, is find a signature you like, contact the author and ask him/her if you can use his/her artwork for your own campaign...