I've picked up from this topic that everyone seems pretty sold on a larger herbal offering. I've seen a lot of unusual suggestions (at least to my unrefined palate!) as far as blends go. However, there seems to be a decided fondness among the suggestors that to me, indicates they would most likely buy it, rather then it being a bit of a lark suggestion.
So I'm thinking, Adagio already seems to be doing pretty darn well with the self-made blends - why not pick up some herbs and expand the notion a little? A partnership with Mountain Rose Herbs might go a long way! Imagine being able to add a dash of lavender (as both daughteroftheking and joco and probably others have suggested) to your favorite tea, or to brew up your very own earthy and full bodied licorice concotion (many have called for licorice here!).
I'm not much of a programmer, but I work with some, and I don't -think- it would be a massive undertaking to associate certain percentages of an herb based on the volume/size they're being added to. For example:
I am making an herbal blend. I decide that I want to add licorice. I have the usual drop-down menu (as we're all familiar with from the current blend-making page). There I have the percentages (10% - 100%), but beside them are the prices (10% = $1.50, something like that), these prices would change based on whether I had a 4oz, 10oz, or a 16oz bag selected. Also, having a sample option, naturally, would be excellent.
That would be the easiest option, but crossovers..the ability to add lavender (either directly or tacking on a sample to your order) to your earl grey bravo, for instance, would also be pretty nifty.
Just an idea