Does any know if there is a way for Marketo to track score our Google paid searches (AdWords) without using a Marketo form landing page? Google said "The UTC code we placed on your site at the start of the campaign has an Adwords pixel installed on it. That pixel cookies anyone who clicks on an ad, then tracks them for 30 days." We will and to create reporting on this as well and pull Smart Lists.
If I understand you correctly, you want to build a smart list of people who visited your page via AdWords, but without requiring them to have completed a form.
The AdWords cookie isn't really going to help you, unless you want to get complicated, but you might be able to accomplish this using a Visits Web Page filter (set to where ever the ad directs them) with a referring URL constraint.