I have been using Adblock Plus for a couple of years now.
I haven't been browsing the web without it since I dicovered it.
Therefore I often recommend it to friends and family. : )
I love the idea of you guys making Adblock Plus stickers! : )
If you are going to consider making such stickers, I would recommend Sticker Mule (stickermule.com) No really. : )
They produce nice quality stickers for Reddit, GitHub, DuckDuckGo amongst others.
I hope you'll consider this idea. : )