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I don't think we've done this, but as a newbie to the artform these are currently 'floating my boat'...
https://www.amazon.co.uk/dp/1785653768/ref=cm_sw_r_cp_apa_i_xnybFb599PZPN
And
https://www.amazon.co.uk/dp/0692390561/ref=cm_sw_r_cp_apa_i_SoybFb4Q079SR
What's your colouring book of choice?
Modern Toss have done a few great ones over the years.
https://shop.moderntoss.com/products/mindless-violence-colouring-book
Recently started this but I'm finding it hard to stay within the lines.
I always liked the anatomy colouring book.
@eyestwice. Some kind of eraser, methinks...
The 'rick & morty' books look quite good, as does this;
https://www.amazon.co.uk/dp/1909763667/ref=cm_sw_r_cp_apa_i_2bAbFbA9E9SPT
Amazon have upped their range of colouring books.
The ‘halo’ inspired books by Anastasia Donovan are great.
(Different covers, but exactly the same inside.)
But what are the best pens?
What you need is the cat bum colouring book.
Cat Butt: An Off-Color Adult Coloring Book for Cat Lovers https://www.amazon.co.uk/dp/1640011765/ref=cm_sw_r_cp_api_glt_fabc_TZT8ARTXT8NYRW23FWHE
But what are the best pens?
Pencils. Blending, mixing, light, dark etc.
Prismacolor Premier is a safe bet

*Ma P7eaven is a serial colourer-innerer. I’ve never tried it but this one looks good:
https://coloringbookaddict.com/fantastic-cities-adult-coloring-book-steve-mcdonald/
Crayola coloured pencils seem far better than the Faber-Castell efforts at the lower end of the market.
Stabilo erasers are great, and you’ll need a decent pencil sharpener.
I like to add some highlights with paper mate inkjoy gel pens.
You could also try using fountain pens. Amazon are selling 8 jinhao fountain pens for about a tenner.
If the paper is decent quality, you might get away with using highlighter pens on some parts.
I’d avoid using felt-tip pens as these can bleed through. Though, when they’re about to dry out, they can add some interesting effects.
Cheers😉