Teapots, bunnys, mermaids... what next?

Todays ponderings have come about through cabin fever mostly... My young apprentice is centre of attention again this week after a day in hospital on Monday having her adenoids removed. She was such a brave girl and has well deserved her entire week off school being pampered and cossetted. But, maaaaan a week is a long time when you're 7 with a sore throat and it's an even longer time when you're the one kept firmly inside away from germs and sources of infection with a boooored 7 year old. (actually.... on reflection, with 2 siblings in the house there's probably more chance of infection inside these walls than out.... but hey, I'm sticking to what it says in the leaflet!)

So.... to spare my sanity after the first 7 loops of High School Musical 3, (plus obligatory bloopers and behind the scenes hilarity), I've snuck into my den and have been creating away like a crazy lady, making the most of this enforced at home time to fulfil a new order of rubbish pictures for next week. But then here comes the dilema...
What exactly to create? An 'open order' is a wondrous thing. A customer who would like 'some pictures', similar to the last batch, but the subject can be 'whatever I fancy'. Wow. After years as 'Wallop' - illustrating for children's publishing in it's various forms, I have become very used to being dictated to exactly what is required. In this pc world we live in, each project generally requires a child of each gender, colour, height, weight, you name it and so artwork briefs are notoriously precise. When they're not, it inevitably means a reworking and so it's become ingrained to try to understand exactly the clients requirements first before ever setting pen to paper or mouse to...erm.... table.
So now I'm all of a wobble. Teetering on the edge of an 'artists block'? Dithering over the possibilities.... So far the Rubbish pictures portfolio has been pretty diverse featuring mermaids, dragons, dogs, cats all sorts... but how to know what will be a best seller? What should I do next, now that I can do....anything? I'd love to know - suggestions on a postcard please.... (or just in a comment would do and would save a stamp :-) )
In the meantime - I'm trying hard not to be distracted by the warblings of the delectable Troy Bolton and concentrating on a few more pre easter bunnys and pre mothers day teacups. Just to be safe.