It's very simple:
Think up a suitable wording for the occasion. Write it out in cursive handwriting so that the letters are all joined up. Now take the dark red pencil and draw a wavy line near the bottom of the card. After a certain distance, depending on the size of the card and the text, the line turns into writing. After the last letter you continue the wavy line.
Then take the orange pencils and shade the area below the line – not evenly, but with soft hatch lines, holding the pencil at a shallow angle. Leave gaps between the hatch lines. Change colours again and hatch in red over the beige. Keep it irregular: that provides an interesting effect.
Be brave: experiment! Try out different colour combinations: various pinks (numbers 125 and 134), blues, turquoise hues (numbers 135 and 147), browns (numbers 176 and 187). Combinations with silver or gold can be very effective. Of course the choice of wording is almost unlimited: Invitation, Congratulations, Birthday party, Happy New Year, and so on, depending on the occasion. You can use the same principle on gift boxes made of card, as the photo shows.