I use Pattern Ease for foundation all the time and like how easy it is to use - the one I buy has a light grid printed on it. It can be left on the block, is washable, unscented and inexpensive. Some ladies use it for a light stabilizer behind their embroidery work.
Another option is using the fabric that makes up a white bridal aisle runner - the texture is like a Pellon interfacing product. - is extremely long and not expensive for the amount of fabric. I still have the one from my daughter's wedding and it will last me forever - heavier than the Pattern Ease but easy to remove from blocks.