This is something I accidentally discovered today when I went to use my modeling paste on a work in progress. There was a big blob of paste on the edge of the jar left from the last time I'd used it where I'd scraped the leftover paste. Obviously I should have stirred the leftovers back down into the jar because that blob had dried out... but not all the way. I pulled it out to throw it away, but when I grabbed it, I realized it was the consistency of clay or play-dough.
I squished it together, grabbed a stamp, and pushed it into the paste. I'll let it air dry then have it on hand for a future project. Ta-da! Fun dimensional piece using materials I had on hand and was just going to throw away.
This is the original stamped piece I made with the large blob of paste. The one with the word stamp was done with paste I scraped from around the top edge of the jar using a pallet knife. As you can see, I use paint on my stamps and don't clean them very much. Ahem.
So, if you happened to have some mostly dried-out bits of modeling paste, give this a shot! You can attach the dried piece to a canvas or journal page, paint over it, layer with it - whatever you want.
*Just be sure you use LIGHT modeling paste because it will be flexible when dried and much easier to work with than regular or "heavy" modeling paste – that kind is very brittle when dry.