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I just cut out doors and windows with an Exacto knife and drew on them with Sharpies and the kids put some doll's house furniture in there. Plastic bottle tops made for a nice path to the houses. All of this stuff comes right out of the play dough easily and can be used again for other play stuff or to go in the recycling.
DIY giant pool bubbles and countless other summer activities and diy projects - 35 Summery DIY Projects And Activities For The Best Summer Ever