My index finger is of course a tennis racket (hopefully you could tell!) done using Barry M Nail Art pens with a base of Elderberry. Middle finger is the traditional Wimbledon strawberries and cream! Creamy base is Coconut, and the strawbs are Bright Red and Spring Green.
Ring finger is a base of Elderberry, and tennis balls using Yellow (I think the original Barry M Yellow may be discontinued now?) and details using a nail art pen. Little finger is the good old Union Jack, done using Blue Grape, White and Bright Red. So many British summer traditions rolled into one manicure! ;)