Seems to be in line with those I've seen for the past, oh, twenty years. Nerdy media (lots of Star Trek, video games), tech stickers, Linux users of course, a lot of political ones (oft left-leaning and lots of tech-related causes and groups like the EFF), some just plain silly/funny. Generally I see laptops with stickers in larger urban areas or university towns. Though honestly even ones I've seen in very small rural areas are generally similar, but maybe that just reflects the culture of those who tend to go to coffee shops and libraries and also wants to adorn their laptop.