If you draw it online, print it out. Use this as the template for your other invitations; cut out the shape, then hold it over colored cardboard and draw around the shape.
[header] How to have a jellybean themed sleepover [title] Make jellybean shaped invitations. [step] Draw a jellybean shape either on paper or using an online drawing program. If you do it on paper, use thicker paper or thin card.