Help!..

I am suffering from chronic 'subject matter ideation disfunction' yeah that's right I dont know what to draw, well not to the extent that I persevere with something to a near complete state. I have tried for what can be about 5 hours on and off to come up with something more spontaneous be it a creature or vehicle design and I just cant come up with anything at the minute and god knows I've stared lots of things only to bin it, That indeed maybe my problem. But I am trying and I rekon once I get over this 'hump' I'll get back into the zone baby.