Jumping spiders make for great pets. Watching them hunt is fascinating, they'll crawl all over anything you put in the terrarium, and they can go without food for weeks at a time. Very low maintenance. And they're usually comfortable with climbing into your palm. I don't do it, because I worry about injuring or stressing them, but my wife loves it. We've never been bitten by a jumping spider.
If you don't like the idea of catching and caging spiders, keep one by a window. The small amount of webbing they leave isn't prominent, unless they have trouble climbing (like in glass terrariums).
Sadly they aren't wild here in the UK, but I've read a lot about them and enjoy the local spiders we get here. Spiders and octopus definitely would be ruling the world if they wanted to.
If you don't like the idea of catching and caging spiders, keep one by a window. The small amount of webbing they leave isn't prominent, unless they have trouble climbing (like in glass terrariums).