Since it was a startup, it had limited budget and time was crutial too.
I would be frank enough to tell that I use to have daily calls with the founder on his ideas and I used to sketch them or scribble them during my calls. Just after the call I use to finalize those ideas, before proceeding further.
The freedom I got here, actually florished the creative thoughts in me, I googled and wondered around the best sites like Dribble, Behance, Pinterest and Facebook to find the current trends and wonderfull design ideas.
I played my best part in creating any new feature for the app.