Like this [1]? These custom results are usually limited to some countries. Like when you search for "color picker" [2] and "bubble level" [3] on mobile. Google is known for testing these features in their services in specific locations so I wouldn't be surprised if people from other countries cannot see them.

[1] http://i.imgur.com/gVFAMhz.png

[2] http://i.imgur.com/JGVNDMN.png

[3] http://i.imgur.com/As7Dp2p.png