One pinner suggested, "Use train tracks as marble tracks in the block center!" I was just wondering about my existing train table/tracks, and if they are still embraced in this approach our Board appears to be moving in.
To expand upon this, the kids create a matching book with a picture of their structure (and their written description complete with labels,etc). You could also use a story telling app--creating a digital book to document and write about their work.
Science/Small Manip - Creative "racetrack" for cars. Creates a secure platform for children to race cars down the ramps. Children could extend this to use different items (balls, blocks, marbles) to see how quickly different objects roll down the ramps.