Go shopping and take a paint swatch with you to compare your colors.

I have learned to use a more basic colour when it comes to bathroom mats. Depending on what feeling you'd like to create in your bathroom you can play around with the colours. A olive green colour could be an option or a deep and dark colour of blue, brown or red for the mat. You could also go all basic and put a light shade of brown/beige. To then add some character to your bathroom, the shower curtain could look remarkable when patterned. I would keep the curtain and mat somewhat in the same colour world so it doesn't get too messy.

Hope you will get a bit further on your project now.

Happy decorating!

I would just use white it is timeless and then add accessories where you need a spat of color and also a nice piece of art with some blues in ti would be nice,I don’t think there is anything nicer than white fluffy towels and bathmat and a shower curtain maybe with a thin blue stripe or bottom hem.

I bet you've already picked your curtain and towels... But if not, you can always pick up a copy of Sherwin-Williams 'Rustic Refined' brochure to give you suggestions on coordinating colors. Copen Blue is on there.