Ideas on creating 3D work whilst maintaining my Illustrative style?

I really want to have an art stall at a craft fair or market, as there are plenty near my area, and would like to add some 3D pieces to my stock.
However they need to be not too costly to make, not too big, and in the same style of my 2D pieces.

Does any one have any ideas for some 3D products I could create? I've thought about things like clay sculptures but have no idea how to go about making them without any kind of kiln (I don't even have an oven lol) or paper/card crafted sculptures with my illustrations on them somehow..

Thank you so much in advance.