We almost always recommend focusing the majority of your branding and graphics on the inside of your mailer, as it is protected from the dirt and other perils of shipping, and it will be the lasting memory your customer has when they first see your product (unboxing experience).
Adding inside print does typically include about a 20-30% increase on a per box cost, but the benefits are numerous.
All of the boxes below are positive copy dark prints over a lighter flood coated solid background color. This is tricky to pull off, but given the right combination of colors, it can work really well.
Please contact us for any specific questions related to your design and vision for your branded packaging.