The echo is used as a glorified speaker: I set it up with their Prime account and it plays all the music she could ever want through voice commands. For some reason she finds it hard to use Siri on her phone, but something about the blue light on the Echo makes it really obvious what's going on. Also, the small things make her happy like asking about the weather or the news.
The Chromebook is nice because it's super hard to mess up - you just install an adblocker and you're good to go. For someone who only uses the computer to surf the web, it's perfect. The best part is I don't have to play tech support anymore :)
I don't think I'd get either of those things for myself, but I'd definitely recommend them for your non-technical family members.
For a more mainstream audience, I dunno, you can't go wrong with a giftcard to Amazon.
[1] http://www.anandtech.com/show/10754/samsung-960-pro-ssd-revi...
[2] https://www.arduino.cc/en/Main/ArduinoStarterKit
[3] https://sites.google.com/site/undefinition/diy-overnightsens... and/or http://www.parts-express.com/overnight-sensations-mt-speaker...
If it's an Apple household with a pair of speakers somewhere, an Airplay target (Raspberry Pi or otherwise) is also pretty nice.
If you have the cash available, a Vive plus a computer powerful enough to run it is an incredible gift. But if your budget's a bit lower than that, a Hubsan x4 and a spare pack of rotors will cost about $50 and provide days of fun for a very wide range of people.
It's one of those gifts that tends to spread through families - I know more than one which started buying a cheap quadcopter for the youngest generation, and ended up with the oldest generation and all the ones in the middle being equally enthusiastic (and often buying their own).
They're also a lot of fun for a group, which is something that can't necessarily be said of a VR headset most of the time.
TIS-100 http://store.steampowered.com/app/370360/ SHENZHEN I/O http://store.steampowered.com/app/504210/
TIS-100 is not very long, but then it's not very expensive.
Now I wanna build an RC car out of them...