Because I like October Afternoon paper so much, thou shalt not waste any.
Thou shalt use them up on cute cards just for fun.
To do this thou shalt find a base colour of a fairly neutral tone and cut it into 15 cm x 15 cm squares (or a 12 x 12 into quarters).
Thou does not have to cut them into 15 x 15 squares, but thou might like to.
Remember, thou is using scraps, so 15 x 15 is a good size.
13 x 13 is a good size, but thou will have wastage from a 12 x 12 sheet.
17 x 17 is also a good size, but thou will also have wastage from a 12 x 12 sheet.
The point of using scraps is to avoid wastage, so go the quarters, yes?
Wondering if thou is keeping up with the terminology - 15 x 15 is in cm and 12 by 12 is inches. You knew that. Thought I'd go between the two, just to keep you on your toes.
Summary of above: Cut your 12 x 12 cardstock into quarters to make four card bases. It's quick and there's no scraps.
But thou could, if thou chooses.
A red heart on the card below wouldn't go astray. Following one's advice is, in fact, a good idea...oh well.