I picked up a setting of 6 (very ugly) placemats from the Op Shop/Thrift store during the week. The upside of them being so ugly is that they were cheap as chips.
Now I've made reversible covers for them. I did a bit of free motion text last year & frankly found it took me longer than embroidery by hand. I'd decided 'twas best left to the experts.
But as this "design" is pretty simple I had another go & I'm thrilled to say the least! If you've no idea where to begin with this sort of thing you should pop in here.
One side for fun & the other a bit more fancy. Best of all they can just be slung in the washing machine when they get a bit grubby.
I think these would make meal time fun for kids if you had a novelty print on one side & the plate on the other. Easier on the eye than anything you can buy at Kmart.
If you don't have any luck at the Op Shop I think that Bunnings &/or Spotlight sell MDF circles about the same size.