I work a lot with air-dry clays which don't require baking. These include paper clay (Mermaid Puffy, Fuwa Fuwa, Hearty Soft) or resin clay (Modena, Grace, Cosmos). You can find them easily from www.somethingkawaii.co.uk or by searching on Etsy.

PAPER CLAY TIPS
1) These are great fun to work with but they may feel a bit 'unsubstantial' if made into jewellery or charms. People prefer to pay more for things that are a bit heavier and expensive, so bear that in mind when choosing materials.
2) Paper clay can be mixed with water to create whipped cream clay. Or you can simply push regular clay through the tip of a piping nozzle to create the icing texture.
3) Paper clay stays softer for longer than resin clay and this makes them more suitable for beginners.

RESIN CLAY TIPS
1) My favourite brand is Modena, which has a very smooth and luxurious texture. However it dries really fast which makes it quite challenging to work with. All unused pieces must be wrapped in clingfilm.
2) Modena dries translucent, but you can reduce this by mixing titanium white acrylic paint into the clay when creating colours.
3) If you're mixing your own colours using paint, they will turn several shades darker when dry. So when working with clay in a softened state, always use a shade that is lighter than you want the result to be. less