T-shirt design for new brand

Looking for a designer for t-shirts and possibly logo for a small company just starting up. Simple punchy designs, the company colours may be Green and Black but not totally settled on this. New brand covering sports such as surfing, BMX, Mountain biking, skateboarding, Motorcycling Snowboarding and other extreme sports. Company will have a rebel attitude and philosophy. Company name is "Sine wave 13" and was influenced by the continual wave of sine wave.