Here's a look at all 30 of the Secret Weapon Washes applied over a white primer coat. Two drops of each wash were applied directly to the piece and feathered out with a brush. The background has been cleaned up but the colors are otherwise untouched. After I do some color matching I'll post this as the official color guide and each wash on the site will be accompanied by a corresponding 584th icon. Looking at all 30 colours together I really like how each wash has a distinct colour and finish -- even those, like Flesh Wash and Dark Sepia, which are similar colours.
30 Secret Weapon Wash Samples
Secret Weapon Miniatures have posted a photo showing the coverage and colour of the 30 washes they offer. From their website: