When I clicked on the
SC75 keyword under her giraffe phot, I can see that there are lots of different measurements. In fact some cards are done in the vertical and some in the horizontal format.
It looks as though you could cut almost anything into three equal size pieces, then stick them onto anthoer piece of CS (cardstock), trim around them rather close, then stamp a little square and mount it the same way - by trimming the CS close.
Some of the cards have two layers behind them and some only one. Have fun trying out different kinds.