Need some wordpress themes to build mobile sites.

Hello,

I want to build some sites to apply for mobile affiliate company such as maxbounty, yeahmobi, peerfly. So the sites must be suitable to view on mobile. Do you guys just build wordpress site on pc and give the site a wordpress theme which will let the site be reviewable on both desktop and mobile? Can you recommend or send me some such wordpress themes?

Thanks in advance,
Aahongmei