Stencils are an under-utilised and inexpensive supply that we often overlook. For example, with these Acorns And Leaves stencils, when the outline is traced with a pencil, it gives a great starting point for clean and simple watercolouring. The pencil outline is just as good as a stamped outline, yet the cost of the stencils is significantly reduced compared to a stamp set. I have another card on my blog showing this technique, too.