To me, a "toy" is some web app that doesn't really do much but is complete enough to be shared publicly to show something off. Go check out the ones I have shared here.
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Star Controls
I wanted to see how these "stars" would look like with different configurations, so I made a control panel.
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WikiGraph
Wikipedia is a highly connected article database, so I made it into a explorable graph.
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GitHub Contributions Breakout
I think the name is clear enough. It's a game of breakout with your GitHub Contrubution figure.