The best way to express a message of love to your father is by writing it, these cakes by wANiE beSh on Flikr are done perfectly, the contrast of the chocolate frosting and the white writing is so effective with the little heart motifs on each.
If your dad just loves watching all kinds of sports (although my own father is not a sports fan at all), why not try this selection of balls by Flour and Sun Bakery
If your sugarcraft skills are up to scratch then try these more detailed sports (and other hobbies) themed cupcakes for Fathers Day by The Frosted Cake N Cookie
I came across these golf course cupcakes and fell in love with them. You can create the sand with crushed up biscuits, the rough with a grass piping nozzle and the green with geen sugar sprinkles. This collection is by Patty Cakes Bakery
Fd006 – Is your dad a fan of fishing? How cute are these little fishing rid cupcakes by Kids Fun Reviewed?
For dads that love photography and have probably taken photos of you at every stage of your life, there are these great camera cupcake decorating ideas by Designer Celebration Cakes
For the non-sporty dads, there are these nice simple designs if he works in an office, by Sweet Talk Cupcakery
Death by Cupcake have made a much more detailed version of the office shirt and tie, which look fab.