Made in Turkey, Beyza Cases' new series of leather iPhone 4 and iPad cases all fall into the sleeve-style category that we're not particularly fond of, but the quality of their leather made them worthy of sharing anyway. The company's iPhone 4 ID Slim (£42) cases have wave-like ID card pockets on the front and back, while its SlimLine, SlimLine Stitches, and SlimLine Stripes (£35-£37) cases feature one-, two-, or three-tone leather with embossed…