Hi procastino,
An idea for girls who may be interested in scrapbooking -- little picture frames. I guess it's obvious which tools I used
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The snowman and beach ball may be outside your parameters for learning skills, but a lot can be done just with the star tool.
PS - Your images aren't showing up for me, I just see the red x. I think it's because there's a redirect in the URL?? Or maybe it's because of the https, I'm not sure?
Edit
The wrench image (I Iooked up the properties) you show gives me the idea of a slingshot, for boys, maybe? And you could probably construct some simple animal forms using the Shapes tools. Or I could imagine a simplified robot or spaceship. At that age, I suspect they would respond more enthusiastically to cool social images. So I could only suggest doing a bit of research on that (because I'm way out of the loop as far as pre-teens).
Edit 2
A snowflake? Or just abstract collage of shapes and objects made with the path operations. Or a stained glass window?