I started by making a pin board for my inspiration: teeny tiny pastries and cakes

 

I sketched some of my favorites and cleaned up the outlines

 

Finally I colored my little cakes. I went for a more realistic, textured style.

 

If you like these you can get them from my RedBubble shop :)

 

they're available as stickers and magnets (I've been very pleasantly surprised by the quality of the magnets)