Gmail Labs feature is awesome, labs provide you extra functionality in Gmail. Time to time Gmail team announces new lab features. Right now there are plenty of lab features available therefore looking for any particular lab feature is a big pain.
Thanks to Gmail team that they introduces a search box to search any of the lab feature quickly according to keyword. You have to go to settings page and click on the Labs tab. Go to this link to directly jump into the option.
Here in the screenshot given below in which I typed image inside the search box. It displayed all the labs features related to images.
It display result quickly as you type in the search box. No need to click on any search button (just like Google instant feature).