This invitation is super easy to make and can be made in virtually any graphics program and many word processing programs.
First pick out DoodleBat images and organize them in a block on the left third of the card. If you puzzle the DoodleBats together (putting some sideways so they fit tightly) you can get a clean, geometric look. Next, center your text on the right two-thirds of the card, using one font for the title and a second font for the information. Make sure to pick out fun colors that fit the event the invitation is for!
For a formal, finished look, print the invitations at your local print shop before passing them out.