Rubbernecker has some amazing florals that are multi-step but more watercolor looking. In fact, you can water color right on the rubber to achieve all kinds of beautiful shading. Many of their sets have the rubber stamp to paint on (or ink creatively, etc) and an outline stamp that is usually done in black. They also have some sets that have 2 or 3 or 4 stamps that are intended to be colored (or inked) according to color group (green stems, red flowers, blue flowers and yellow flowers, for example). Take a look:
Watercolor Stamps
2step stamping
