I've been playing with gin and tonics this weekend. I've come across some tasty combos.
1) Rosemary and cucumber g&t.
    Muddle 2 slices of cucumber with a small sprig of fresh rosemary, the juice of one wedge of lime, and a ounce of beefeater 24. 
    Strain into a glass of ice, add one more ounce of gin, and top with 4oz of Q tonic. Stir.
    Garnish with a sprig of rosemary and a slice of fresh cucumber. 
2) Grapefruit Basil g&t
    Muddle 1 leaf of fresh basil and 1 segment of grapefruit (no skin) with 1 oz of beefeater 24 gin.
    Strain into a glass of ice and add 1 more ounce of gin. 
    Top with 4oz Q tonic, stir,  and garnish with a segment of grapefruit (no skin).
3) Lime and orange g&t.
   Start with 2 lime wedges squeezed into a glass. (place the husks of lime in the glass)
   Fill glass with ice, 2oz bluecoat gin and 4 oz Q tonic. 
   1 dash of orange bitters.
   Stir.