I have seen a Viking hoard, I hope never to see the other.
Oh, it can be worse than you thought. Much worse. Picture a Viking horde swarming up over the hill toward your monastery. Got that picture firmly in mind? What colors are they wearing?
An SCA acquaintance was doing primary research on dyes available to the medieval-era Norse, lichen and other natural dyes. She used them to dye wool, and was making socks with the result -- lemon yellow and lilac.
Was that Viking horde wearing dull earth colors, mostly browns and grays? NOW picture them in lilac and lemon yellow!