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"Need a pentagonal pyramid that's six inches tall? Or a number line that goes from ‑18 to 32 by 5's? Or a set of pattern blocks where all shapes have one-inch sides? You can create all those things and more with the Dynamic Paper tool. Place the images you want, then export it as a PDF activity sheet for your students or as a JPEG image for use in other applications or on the web."

Not similar but people will think of Wordle when they see this.

Textorizer takes a raster image in a format such as png, jpeg or gif, detects edges using a Sobel convolution filter and replaces them with supplied lines of text.

Great infographic on teacher responses regarding effectiveness of education materials.