Brick stack is very forgiving, good choice !! Can add an applique, after you get the top made,
*fabric measurement*
Amount of fabric will be based on how many colors, and how big you'll be making the bricks, minus the seams. (get your math on :)) Or do like many of us or just me ;) overbuy, make pillows, with whats left, add to the stash like bernie mentioned :).
There are sites Q sites that have the measurements available, Happy Quilting !!