This is the character Monkey from the animated show Dexter's Laboratory. It stands approx. 20" tall. This is a pretty old piece. It was made using Sign Foam, dowel rods and automotive paint. He was sculpted in sections and assembled later. If memory serves there were 16 pieces that were glued together after painting.
This is Milk and Cheese from the hilarious comic of the same name. They stand approx. 10" tall. They are also older pieces constructed the same way as Monkey.