They vary... sometimes plants, sometimes 动物 (I often invent my own creatures), other times just the 随意 practicing of techniques like drawing 火影忍者 character faces from memory, 或者 blending colours. Occasionally I even draw people, though that is not my area of expertise. :P The quality depends on what mood I'm in. Oh and I also like to doodle 随意 decorative stuff like clouds and stars. :3