Draw any cat of your choice...All traditional mediums like painting and all are allowed...You can have a look at this wonderful tutorial written by Tapiona for an idea how to draw cats...
http://www.pxleyes.com/tutorial/traditional-drawing/1493/Learn-How-To-Draw-Four-Different-Cats.html
Have fun!!
3D: recreate the Lego buildingblocks and use them to create your own 3D Lego building, vehicle, landscape or whatever.
You can also recreate the Lego figures / puppets and use them in your image.
BUT: just use Lego shapes, other objects are not allowed!
TRADITIONAL DRAWING: make your own surreal drawing.
More info on surrealism: http://en.wikipedia.org/wiki/Surrealism
All traditional techniques are welcome (incl. fi painting and watercolor).