Blend until a soft dough forms.

NPR: Red, White and Blue Desserts

They settled on a cotton-modal blend (modal is a form of rayon) that offered a soft feel, attractive drape and absorbed color well.

WSJ: Polo Puzzle: What Goes Into a $155 Price Tag?

In the following video, you can see one of these soft contraptions as it journeys onto a bed of rocks and then uses colored liquid to blend into its surroundings.

ENGADGET: DARPA's low-cost silicone robot cloaks like a chameleon, treks like a snail (video)