I float in the sky. Sometimes I'm white, sometimes I bring rain. What am I?

What has four legs but cannot walk? Solve the riddle → I am round and shimmering, but burst with a blink. You can blow me with a wand, then you see me float, then I am nothing. I drift in the air, light and clear. What am I? Solve the riddle → I have a picture on my front and a sticky back that can be stuck. What am I? Solve the riddle → I have four legs but cannot walk. I have a back but cannot speak. You use me when you want to rest. What am I? Solve the riddle → I am pink and live in mud. I say "oink oink". Solve the riddle →