I'll put my hands up, I use cheap Primark sheets and pillowcases as they wash really well and DH tends to make expensive sheets really bobbly so they have to go out after about 2 years. I resent paying lots of money for expensive stuff to only have to chuck it, so cheap and cheerful does me.
However, I do like 'naice' duvet covers and top pillows, but am struggling to find any in the shops. DH doesn't like satins or sequins etc, although doesn't mind flat embroidery. Price maybe about £30-40 (or cheaper! ) as for some reason the covers last much better.
Design should be nothing floral and purple/burgundy/blues for colour.