Names and faces to bikes

yo, my boyfriend's been riding fixed for about a year but i've yet to pick up any tips and need to buy his birthday present really soon. can anyone suggest any accessories apart from courier bags?? safe

Cycling cap? Team ones are about £6, LCEF about the same (depending on where you buy it), swrve & rapha about £10-12, smear up to £25, rapha wool about £30. Price and style to suit all tastes!