Four Color Theorem (DeviantArt 16)

I saw the template image for DeviantArt's 16th birthday and it just screamed "Four Color Theorem", so I picked four colours from the DeviantArt colour palette and made it an exercise in the four colour theorem.

For those who haven't heard of it, the four colour theorem states that for any map, you don't need any more than four colours to colour the map in such a way that no two regions that share an edge (although they may share a corner) are the same colour.