Vampires on earth

Enemies; they abound everywhere
Visible and invisible to man
Where there is no refuge on earth
Like fairies from Mars

Let me paint colours and words
With sighs repeated over and over
The mood which seasons bring but not take away

What are their colours?
Mostly nameless colours
Colours you wouldn't like to see
Perhaps more like purplish
All various shapes and forms
Very strange creatures, utterly peculiar
Each perfectly unlike his neighbor

Describe just one of them
Marvellous creatures
Addition to offences
Ther mars destroyers
And ritual bathing
See how they are poised
They fret and fume
The colourless ones
The marauding Kangaroos