When making homemade birthday cards, keep the design and color scheme simple. Consider dark colors for men and pastels for ladies. Use colored card stock, or only print the border in color to save ink.
Gather small decorative elements such as silk flowers or ribbons, and play with arranging them before gluing them onto the card. If printing a message onto the card with a computer, test print on a plain piece of paper first to make sure it looks right. Experiment with different fonts and sizes. Using clip art and photos makes it easy to tailor a card to the recipient's interests.