Pictures without a lot of fine detail work best. The text can be words relevant to the subject of the picture,  or anything at all. The length of the text file doesn't matter, one sentence or a novel, WordIt! will automatically repeat the text to create the picture, or use only what it needs for longer sources. For some pictures, even a single word or two can be effective, repeated. ("Love" for a valentine, for example, or "Happy Easter !!", as shown below)

The original picture can also be blended back, at adjustable strength, with the picture, as in this picture

WordIt! can also create picture made up of dots, as newspaper pictures are. The size of the dots is adjustable.