If you want to do a 1/4" border - especially effective in a dark colour as an inner frame - you can cut a 3/4" strip, sew to the top with a 1/4" seam as usual then press this seam towards the skinny border - this seam allowance gives you a ridge to guide your foot as you sew on the next border, giving you a perfect 1/4" border. I haven't tried it yet - I saw it in a book!