I like skulls because they are powerful icons. They represent many poignant things. Life, death, mortality, fear, even freedom.
By making them colourful, ornate, lively, it softens their confrontational power and makes them accessible and almost friendly. After all, every skull used to be someone kicking around on the planet with organs and vessels in a skin sack attached.
They evoke contemplation about the past and the future. In a sense about the whole enterprise of existence. How fragile it is, how temporary, how paradoxical. No one knows what is next - it's life's greatest mystery - but a skull is a reminder - it's coming!
Making them into colourful art is like trying to bring some life back to the dead. Not possible, but fun to try.
You can see some of my recent skull work on this site - click on skull guru. Git some skull into ya!