Last but not least are the painterly techniques of watercolor, acrylic, pastel, chalk, ink and other art materials used to create images for cards. Water should be used sparingly so the card stock will not buckle. Pastel and chalk or charcoal must have some type of sizing applied so that the recipient does not smudge the image. Use a good quality fixative so that the card will not deteriorate over time. Permanent ink drawings are a delight, and color can be added in the form of watercolor or acrylic.
Images can be basic, simple color blocks with other materials added for interest.
Most effective might be the combination of several of the techniques described above. Acrylic or watercolor washes with ink drawings and bits of slightly dimensional material can be very striking, while collage with paint or pastel can be beautiful mixed media presentations. Experiment and see what looks are most interesting and satisfying to you. Remember, also, to embellish the envelope to create a matched set of card and envelope. The same line drawing style or pastel work can be added in small areas of the flap, and a coordinated look will be created.