Using Blocks to Create a Background

Have you ever used acrylic blocks to create a background?  I have used this technique once before at a Canal Street class.  This is a CASED card from Mary Fish.  The colors I used are very similar to hers but not the same.  If you want the background to be softer, ink the block and stamp of on scratch paper one time before stamping on your card.  Here's the card below we made at Canal Street class a while back with this technique.  Were you there?