Colored flower/ Extra fingers

According to the book Survival of the sickest, the flowers appears to be this way because of an inherited mutation in its cells. Since scientists found that mutations are inherited when they are beneficial or neutral, therefore this mutation most probably increase the chances of its survival, for example a camouflage while at the same time it may also have no effects on the survival of this species. 

As Your Inner Fish mentioned, hands with extra fingers is due to the ZPA (very similar to the sonic hedgehog genes), specifically too much skin concentrated in a ZPA zone. These genes contains the instructions for a body to construct fingers, and most probably there's extra ZPA gene thus causing more fingers to grow from the baby's hand.