It's really helpful to see all the colours because - especially when it comes to the cheaper sets - the colours on the outside of pens & pencils don't always accurately represent the ink/pencil colour you get.
Ryman Fibre Tip Pens & WHSmith "Let's Create" Colouring Pens.
Pentel Arts Studio Pen Set (affiliate link) & WHSmith Artists Colouring Pencils.
Am I a total nerd for making these charts? Probably. Do they make me happy? Totally!