I usually either go flat or slice down the T ad throw in the odd body serve.. but to back up TitusZidane's point
- If your serve is big enough, perhaps go for the big flat serve into the corner of the service box, almost hit it inside out so you impart no spin and just out and out power. This is the bread and butter serve for players like Roddick, but I've very rarely seen it mastered at amateur level.
... If it can be mastered this is obviously a great weapon. Although I've been able to do this sometimes in practice I've only managed it once in a match which I lost 6-3 3-6 2-6 - it was one of my worst serving days and I hadn't hit a single unreturnable serve all day, when I was down match-point for the second time I just blasted the ball as hard as I could (with plenty of anger), I hit it exactly as TitusZidane described it and the ball bounced up off the court, over the 10 foot high fence and away - it did clip the top of the fence first... I'm not superman
This would probably take a lot of hours (pro-hours) to perfect so anyone who isn't a pro will either need to be very dedicated or very gifted to do this.
The kicker would probably be your best bet.