The shops may be saturated with adult colouring books, but forget all the boring ones. The Works sell tattoo design ones for £3, and they look awesome. Use promo code VKING20 at the checkout and they cost just £2.40.
If you're into tattoos, then these will appeal to you. The designs vary from celtic to dragons, skulls to roses and more.
You don't need to be planning a full sleeve to get enjoyment out of these books, but I do think they will inspire those wanting new ink.
Click and collect is FREE from a The Works store near you, or pay £2.99 for home delivery.