I've gone with a polished metal look which will stand out on dark surfaces and if you do use actual metal for signage then a brushed steel or aluminium would look sensational
I've also incorporated the number "45" into the design
Really great designs! Thank you! I appreciate you considering signage and materials. #21 I like in particular. I would worry though this might be too masculine of a look. Great work! I hope to see more
too masculine not really it's bold yes and for such a short letter word it really should have weight to it and with a semi-serif type face it adds a touch of softness to it.
but I'll see what else I can come up with using the same design style.