Not for a colour guide - for codes only as colours are not exact.
To see metallic colours look online and type in names to see colour swatch from paper suppliers.

All your DL, C6 (A5) and 80x120mm cards come supplied with complimentary standard white envelopes  (basic Officeworks brand) unless you order classic white, coloured or metallic at additional costs. (If you choose to buy envelopes at the additional costs, then the free standard white envelopes will not be sent with your order.)
Square invitations do not come with complimentary envelopes.
With Square invitations 120x120mm please see the display proof page to see the colours available as colours are limited for the envelope size 130x130mm.  Prices for 130sq envelopes are  specified on designs.

Each envelope has a CODE (eg. EN03 is Suni Yellow), so please specify which envelope you would like with your order. Most envelopes come in all the sizes required for your cards/invitations. Some colours are not available for the 11B envelopes so you will be contacted to make alternative choice.

Not sure what colour will suit your stationery, please call and we can offer you suggestions.