Boredom.

Deidara's blue eyes glanced towards the ceiling, his expression one of pure boredom. I didn't expect the room to be so quiet without Tobi, yeah... He thought, turning on the couch to a more comfortable spot. As of now, Deidara was mission-less; both Tobi and himself had no assigned mission for the time being, and Tobi was surprisingly gone from Deidara's sight. Not that he minded, of course. He enjoys his salvation away from the masked nin when he can.
What to do, what to do... The blonde ninja examined his palms, both of which had mouths on their surfaces. His eye underneath his blonde sidebang twitched as he remembered the comment from Tobi one day, asking if he ever used his hands to makeout. The blonde had never answered, and tried to ignore Tobi's pestering... easier said than done.
Reaching into his clay bag, Deidara then began to create a design with the clay, his mind directing the mouth on his palm of how to shape his art.