I recently watched a You Tube video where a talented card maker used a 1/2 sheet of 12" x 12" paper to make a few slim line card. Her cards were very long.... I decided to make my bases a little smaller than hers and adapted the papers. I ended up making two long cards and then decided mini slimlines are more my style. I made one using some of the papers I had cut (still have three small peices to use)
Here are the two long slimlines.