How large is the finished quilt? The blocks? Do you want the background fabric to be predominant (yellow)or more of a accent/blender (beige)?
If you tend to lean towards bright and cheerful quilts ~ then the yellow would accomplish that.
With the beige it would showcase the block(s) and be 'quieter' then the yellow.
You will get votes for each background color ~ BUT it come down to "QUILTER CHOICE"!